drivers/acpi/video_detect.c

   1 /*
   2  *  Copyright (C) 2015       Red Hat Inc.
   3  *                           Hans de Goede <hdegoede@redhat.com>
   4  *  Copyright (C) 2008       SuSE Linux Products GmbH
   5  *                           Thomas Renninger <trenn@suse.de>
   6  *
   7  *  May be copied or modified under the terms of the GNU General Public License
   8  *
   9  * video_detect.c:
  10  * After PCI devices are glued with ACPI devices
  11  * acpi_get_pci_dev() can be called to identify ACPI graphics
  12  * devices for which a real graphics card is plugged in
  13  *
  14  * Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
  15  * are available, video.ko should be used to handle the device.
  16  *
  17  * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
  18  * sony_acpi,... can take care about backlight brightness.
  19  *
  20  * Backlight drivers can use acpi_video_get_backlight_type() to determine which
  21  * driver should handle the backlight. RAW/GPU-driver backlight drivers must
  22  * use the acpi_video_backlight_use_native() helper for this.
  23  *
  24  * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
  25  * this file will not be compiled and acpi_video_get_backlight_type() will
  26  * always return acpi_backlight_vendor.
  27  */
  28
  29 #include <linux/export.h>
  30 #include <linux/acpi.h>
  31 #include <linux/apple-gmux.h>
  32 #include <linux/backlight.h>
  33 #include <linux/dmi.h>
  34 #include <linux/module.h>
  35 #include <linux/pci.h>
  36 #include <linux/platform_data/x86/nvidia-wmi-ec-backlight.h>
  37 #include <linux/pnp.h>
  38 #include <linux/types.h>
  39 #include <linux/workqueue.h>
  40 #include <acpi/video.h>
  41
  42 static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
  43 static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
  44
  45 static void acpi_video_parse_cmdline(void)
  46 {
  47         if (!strcmp("vendor", acpi_video_backlight_string))
  48                 acpi_backlight_cmdline = acpi_backlight_vendor;
  49         if (!strcmp("video", acpi_video_backlight_string))
  50                 acpi_backlight_cmdline = acpi_backlight_video;
  51         if (!strcmp("native", acpi_video_backlight_string))
  52                 acpi_backlight_cmdline = acpi_backlight_native;
  53         if (!strcmp("nvidia_wmi_ec", acpi_video_backlight_string))
  54                 acpi_backlight_cmdline = acpi_backlight_nvidia_wmi_ec;
  55         if (!strcmp("apple_gmux", acpi_video_backlight_string))
  56                 acpi_backlight_cmdline = acpi_backlight_apple_gmux;
  57         if (!strcmp("dell_uart", acpi_video_backlight_string))
  58                 acpi_backlight_cmdline = acpi_backlight_dell_uart;
  59         if (!strcmp("none", acpi_video_backlight_string))
  60                 acpi_backlight_cmdline = acpi_backlight_none;
  61 }
  62
  63 static acpi_status
  64 find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
  65 {
  66         struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle);
  67         long *cap = context;
  68         struct pci_dev *dev;
  69
  70         static const struct acpi_device_id video_ids[] = {
  71                 {ACPI_VIDEO_HID, 0},
  72                 {"", 0},
  73         };
  74
  75         if (acpi_dev && !acpi_match_device_ids(acpi_dev, video_ids)) {
  76                 dev = acpi_get_pci_dev(handle);
  77                 if (!dev)
  78                         return AE_OK;
  79                 pci_dev_put(dev);
  80                 *cap |= acpi_is_video_device(handle);
  81         }
  82         return AE_OK;
  83 }
  84
  85 /* This depends on ACPI_WMI which is X86 only */
  86 #ifdef CONFIG_X86
  87 static bool nvidia_wmi_ec_supported(void)
  88 {
  89         struct wmi_brightness_args args = {
  90                 .mode = WMI_BRIGHTNESS_MODE_GET,
  91                 .val = 0,
  92                 .ret = 0,
  93         };
  94         struct acpi_buffer buf = { (acpi_size)sizeof(args), &args };
  95         acpi_status status;
  96
  97         status = wmi_evaluate_method(WMI_BRIGHTNESS_GUID, 0,
  98                                      WMI_BRIGHTNESS_METHOD_SOURCE, &buf, &buf);
  99         if (ACPI_FAILURE(status))
 100                 return false;
 101
 102         /*
 103          * If brightness is handled by the EC then nvidia-wmi-ec-backlight
 104          * should be used, else the GPU driver(s) should be used.
 105          */
 106         return args.ret == WMI_BRIGHTNESS_SOURCE_EC;
 107 }
 108 #else
 109 static bool nvidia_wmi_ec_supported(void)
 110 {
 111         return false;
 112 }
 113 #endif
 114
 115 /* Force to use vendor driver when the ACPI device is known to be
 116  * buggy */
 117 static int video_detect_force_vendor(const struct dmi_system_id *d)
 118 {
 119         acpi_backlight_dmi = acpi_backlight_vendor;
 120         return 0;
 121 }
 122
 123 static int video_detect_force_video(const struct dmi_system_id *d)
 124 {
 125         acpi_backlight_dmi = acpi_backlight_video;
 126         return 0;
 127 }
 128
 129 static int video_detect_force_native(const struct dmi_system_id *d)
 130 {
 131         acpi_backlight_dmi = acpi_backlight_native;
 132         return 0;
 133 }
 134
 135 static int video_detect_portege_r100(const struct dmi_system_id *d)
 136 {
 137         struct pci_dev *dev;
 138         /* Search for Trident CyberBlade XP4m32 to confirm Portégé R100 */
 139         dev = pci_get_device(PCI_VENDOR_ID_TRIDENT, 0x2100, NULL);
 140         if (dev)
 141                 acpi_backlight_dmi = acpi_backlight_vendor;
 142         return 0;
 143 }
 144
 145 static const struct dmi_system_id video_detect_dmi_table[] = {
 146         /*
 147          * Models which should use the vendor backlight interface,
 148          * because of broken ACPI video backlight control.
 149          */
 150         {
 151          /* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */
 152          .callback = video_detect_force_vendor,
 153          /* Acer KAV80 */
 154          .matches = {
 155                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 156                 DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
 157                 },
 158         },
 159         {
 160          .callback = video_detect_force_vendor,
 161          /* Asus UL30VT */
 162          .matches = {
 163                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 164                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
 165                 },
 166         },
 167         {
 168          .callback = video_detect_force_vendor,
 169          /* Asus UL30A */
 170          .matches = {
 171                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 172                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
 173                 },
 174         },
 175         {
 176          .callback = video_detect_force_vendor,
 177          /* Asus X55U */
 178          .matches = {
 179                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 180                 DMI_MATCH(DMI_PRODUCT_NAME, "X55U"),
 181                 },
 182         },
 183         {
 184          /* https://bugs.launchpad.net/bugs/1000146 */
 185          .callback = video_detect_force_vendor,
 186          /* Asus X101CH */
 187          .matches = {
 188                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 189                 DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
 190                 },
 191         },
 192         {
 193          .callback = video_detect_force_vendor,
 194          /* Asus X401U */
 195          .matches = {
 196                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 197                 DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
 198                 },
 199         },
 200         {
 201          .callback = video_detect_force_vendor,
 202          /* Asus X501U */
 203          .matches = {
 204                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 205                 DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
 206                 },
 207         },
 208         {
 209          /* https://bugs.launchpad.net/bugs/1000146 */
 210          .callback = video_detect_force_vendor,
 211          /* Asus 1015CX */
 212          .matches = {
 213                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 214                 DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
 215                 },
 216         },
 217         {
 218          .callback = video_detect_force_vendor,
 219          /* Samsung N150/N210/N220 */
 220          .matches = {
 221                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 222                 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
 223                 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
 224                 },
 225         },
 226         {
 227          .callback = video_detect_force_vendor,
 228          /* Samsung NF110/NF210/NF310 */
 229          .matches = {
 230                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 231                 DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
 232                 DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
 233                 },
 234         },
 235         {
 236          .callback = video_detect_force_vendor,
 237          /* Samsung NC210 */
 238          .matches = {
 239                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 240                 DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
 241                 DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
 242                 },
 243         },
 244
 245         /*
 246          * Models which should use the vendor backlight interface,
 247          * because of broken native backlight control.
 248          */
 249         {
 250          .callback = video_detect_force_vendor,
 251          /* Sony Vaio PCG-FRV35 */
 252          .matches = {
 253                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 254                 DMI_MATCH(DMI_PRODUCT_NAME, "PCG-FRV35"),
 255                 },
 256         },
 257         {
 258          .callback = video_detect_force_vendor,
 259          /* Panasonic Toughbook CF-18 */
 260          .matches = {
 261                 DMI_MATCH(DMI_SYS_VENDOR, "Matsushita Electric Industrial"),
 262                 DMI_MATCH(DMI_PRODUCT_NAME, "CF-18"),
 263                 },
 264         },
 265
 266         /*
 267          * Toshiba models with Transflective display, these need to use
 268          * the toshiba_acpi vendor driver for proper Transflective handling.
 269          */
 270         {
 271          .callback = video_detect_force_vendor,
 272          .matches = {
 273                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 274                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
 275                 },
 276         },
 277         {
 278          .callback = video_detect_force_vendor,
 279          .matches = {
 280                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 281                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
 282                 },
 283         },
 284
 285         /*
 286          * Toshiba Portégé R100 has working both acpi_video and toshiba_acpi
 287          * vendor driver. But none of them gets activated as it has a VGA with
 288          * no kernel driver (Trident CyberBlade XP4m32).
 289          * The DMI strings are generic so check for the VGA chip in callback.
 290          */
 291         {
 292          .callback = video_detect_portege_r100,
 293          .matches = {
 294                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 295                 DMI_MATCH(DMI_PRODUCT_NAME, "Portable PC"),
 296                 DMI_MATCH(DMI_PRODUCT_VERSION, "Version 1.0"),
 297                 DMI_MATCH(DMI_BOARD_NAME, "Portable PC")
 298                 },
 299         },
 300
 301         /*
 302          * Models which need acpi_video backlight control where the GPU drivers
 303          * do not call acpi_video_register_backlight() because no internal panel
 304          * is detected. Typically these are all-in-ones (monitors with builtin
 305          * PC) where the panel connection shows up as regular DP instead of eDP.
 306          */
 307         {
 308          .callback = video_detect_force_video,
 309          /* Apple iMac14,1 */
 310          .matches = {
 311                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 312                 DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,1"),
 313                 },
 314         },
 315         {
 316          .callback = video_detect_force_video,
 317          /* Apple iMac14,2 */
 318          .matches = {
 319                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 320                 DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,2"),
 321                 },
 322         },
 323
 324         /*
 325          * These models have a working acpi_video backlight control, and using
 326          * native backlight causes a regression where backlight does not work
 327          * when userspace is not handling brightness key events. Disable
 328          * native_backlight on these to fix this:
 329          * https://bugzilla.kernel.org/show_bug.cgi?id=81691
 330          */
 331         {
 332          .callback = video_detect_force_video,
 333          /* ThinkPad T420 */
 334          .matches = {
 335                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 336                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
 337                 },
 338         },
 339         {
 340          .callback = video_detect_force_video,
 341          /* ThinkPad T520 */
 342          .matches = {
 343                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 344                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
 345                 },
 346         },
 347         {
 348          .callback = video_detect_force_video,
 349          /* ThinkPad X201s */
 350          .matches = {
 351                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 352                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
 353                 },
 354         },
 355         {
 356          .callback = video_detect_force_video,
 357          /* ThinkPad X201T */
 358          .matches = {
 359                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 360                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
 361                 },
 362         },
 363
 364         /* The native backlight controls do not work on some older machines */
 365         {
 366          /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
 367          .callback = video_detect_force_video,
 368          /* HP ENVY 15 Notebook */
 369          .matches = {
 370                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 371                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
 372                 },
 373         },
 374         {
 375          .callback = video_detect_force_video,
 376          /* SAMSUNG 870Z5E/880Z5E/680Z5E */
 377          .matches = {
 378                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 379                 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
 380                 },
 381         },
 382         {
 383          .callback = video_detect_force_video,
 384          /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
 385          .matches = {
 386                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 387                 DMI_MATCH(DMI_PRODUCT_NAME,
 388                           "370R4E/370R4V/370R5E/3570RE/370R5V"),
 389                 },
 390         },
 391         {
 392          /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
 393          .callback = video_detect_force_video,
 394          /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
 395          .matches = {
 396                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 397                 DMI_MATCH(DMI_PRODUCT_NAME,
 398                           "3570R/370R/470R/450R/510R/4450RV"),
 399                 },
 400         },
 401         {
 402          /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
 403          .callback = video_detect_force_video,
 404          /* SAMSUNG 670Z5E */
 405          .matches = {
 406                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 407                 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
 408                 },
 409         },
 410         {
 411          /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
 412          .callback = video_detect_force_video,
 413          /* SAMSUNG 730U3E/740U3E */
 414          .matches = {
 415                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 416                 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
 417                 },
 418         },
 419         {
 420          /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
 421          .callback = video_detect_force_video,
 422          /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
 423          .matches = {
 424                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 425                 DMI_MATCH(DMI_PRODUCT_NAME,
 426                           "900X3C/900X3D/900X3E/900X4C/900X4D"),
 427                 },
 428         },
 429         {
 430          /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
 431          .callback = video_detect_force_video,
 432          /* Dell XPS14 L421X */
 433          .matches = {
 434                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 435                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
 436                 },
 437         },
 438         {
 439          /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
 440          .callback = video_detect_force_video,
 441          /* Dell XPS15 L521X */
 442          .matches = {
 443                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 444                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
 445                 },
 446         },
 447         {
 448          /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
 449          .callback = video_detect_force_video,
 450          /* SAMSUNG 530U4E/540U4E */
 451          .matches = {
 452                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 453                 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
 454                 },
 455         },
 456         {
 457          /* https://bugs.launchpad.net/bugs/1894667 */
 458          .callback = video_detect_force_video,
 459          /* HP 635 Notebook */
 460          .matches = {
 461                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 462                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
 463                 },
 464         },
 465
 466         /* Non win8 machines which need native backlight nevertheless */
 467         {
 468          /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
 469          .callback = video_detect_force_native,
 470          /* Lenovo Ideapad S405 */
 471          .matches = {
 472                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 473                 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
 474                 },
 475         },
 476         {
 477          /* https://bugzilla.suse.com/show_bug.cgi?id=1208724 */
 478          .callback = video_detect_force_native,
 479          /* Lenovo Ideapad Z470 */
 480          .matches = {
 481                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 482                 DMI_MATCH(DMI_PRODUCT_VERSION, "IdeaPad Z470"),
 483                 },
 484         },
 485         {
 486          /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
 487          .callback = video_detect_force_native,
 488          /* Lenovo Ideapad Z570 */
 489          .matches = {
 490                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 491                 DMI_MATCH(DMI_PRODUCT_VERSION, "Ideapad Z570"),
 492                 },
 493         },
 494         {
 495          .callback = video_detect_force_native,
 496          /* Lenovo E41-25 */
 497          .matches = {
 498                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 499                 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
 500                 },
 501         },
 502         {
 503          .callback = video_detect_force_native,
 504          /* Lenovo E41-45 */
 505          .matches = {
 506                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 507                 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
 508                 },
 509         },
 510         {
 511          .callback = video_detect_force_native,
 512          /* Lenovo Slim 7 16ARH7 */
 513          .matches = {
 514                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 515                 DMI_MATCH(DMI_PRODUCT_NAME, "82UX"),
 516                 },
 517         },
 518         {
 519          .callback = video_detect_force_native,
 520          /* Lenovo ThinkPad X131e (3371 AMD version) */
 521          .matches = {
 522                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 523                 DMI_MATCH(DMI_PRODUCT_NAME, "3371"),
 524                 },
 525         },
 526         {
 527          .callback = video_detect_force_native,
 528          /* Apple iMac11,3 */
 529          .matches = {
 530                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 531                 DMI_MATCH(DMI_PRODUCT_NAME, "iMac11,3"),
 532                 },
 533         },
 534         {
 535          /* https://gitlab.freedesktop.org/drm/amd/-/issues/1838 */
 536          .callback = video_detect_force_native,
 537          /* Apple iMac12,1 */
 538          .matches = {
 539                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 540                 DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,1"),
 541                 },
 542         },
 543         {
 544          /* https://gitlab.freedesktop.org/drm/amd/-/issues/2753 */
 545          .callback = video_detect_force_native,
 546          /* Apple iMac12,2 */
 547          .matches = {
 548                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 549                 DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,2"),
 550                 },
 551         },
 552         {
 553          .callback = video_detect_force_native,
 554          /* Apple MacBook Air 7,2 */
 555          .matches = {
 556                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 557                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir7,2"),
 558                 },
 559         },
 560         {
 561          .callback = video_detect_force_native,
 562          /* Apple MacBook Air 9,1 */
 563          .matches = {
 564                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 565                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir9,1"),
 566                 },
 567         },
 568         {
 569          .callback = video_detect_force_native,
 570          /* Apple MacBook Pro 9,2 */
 571          .matches = {
 572                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 573                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro9,2"),
 574                 },
 575         },
 576         {
 577          .callback = video_detect_force_native,
 578          /* Apple MacBook Pro 11,2 */
 579          .matches = {
 580                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 581                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro11,2"),
 582                 },
 583         },
 584         {
 585          /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
 586          .callback = video_detect_force_native,
 587          /* Apple MacBook Pro 12,1 */
 588          .matches = {
 589                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 590                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
 591                 },
 592         },
 593         {
 594          .callback = video_detect_force_native,
 595          /* Apple MacBook Pro 16,2 */
 596          .matches = {
 597                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 598                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro16,2"),
 599                 },
 600         },
 601         {
 602          .callback = video_detect_force_native,
 603          /* Dell Inspiron N4010 */
 604          .matches = {
 605                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 606                 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
 607                 },
 608         },
 609         {
 610          .callback = video_detect_force_native,
 611          /* Dell Vostro V131 */
 612          .matches = {
 613                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 614                 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 615                 },
 616         },
 617         {
 618          /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
 619          .callback = video_detect_force_native,
 620          /* Dell XPS 17 L702X */
 621          .matches = {
 622                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 623                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
 624                 },
 625         },
 626         {
 627          .callback = video_detect_force_native,
 628          /* Dell Precision 7510 */
 629          .matches = {
 630                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 631                 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
 632                 },
 633         },
 634         {
 635          .callback = video_detect_force_native,
 636          /* Dell Studio 1569 */
 637          .matches = {
 638                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 639                 DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1569"),
 640                 },
 641         },
 642         {
 643          .callback = video_detect_force_native,
 644          /* Acer Aspire 3830TG */
 645          .matches = {
 646                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 647                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3830TG"),
 648                 },
 649         },
 650         {
 651          .callback = video_detect_force_native,
 652          /* Acer Aspire 4810T */
 653          .matches = {
 654                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 655                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 4810T"),
 656                 },
 657         },
 658         {
 659          .callback = video_detect_force_native,
 660          /* Acer Aspire 5738z */
 661          .matches = {
 662                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 663                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
 664                 DMI_MATCH(DMI_BOARD_NAME, "JV50"),
 665                 },
 666         },
 667         {
 668          /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
 669          .callback = video_detect_force_native,
 670          /* Acer Aspire 5741 */
 671          .matches = {
 672                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 673                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
 674                 },
 675         },
 676         {
 677          /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
 678          .callback = video_detect_force_native,
 679          /* Acer Aspire 5750 */
 680          .matches = {
 681                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 682                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
 683                 },
 684         },
 685         {
 686          /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
 687          .callback = video_detect_force_native,
 688          /* Acer Extensa 5235 */
 689          .matches = {
 690                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 691                 DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
 692                 },
 693         },
 694         {
 695          .callback = video_detect_force_native,
 696          /* Acer TravelMate 4750 */
 697          .matches = {
 698                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 699                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
 700                 },
 701         },
 702         {
 703          /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
 704          .callback = video_detect_force_native,
 705          /* Acer TravelMate 5735Z */
 706          .matches = {
 707                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 708                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
 709                 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
 710                 },
 711         },
 712         {
 713          /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
 714          .callback = video_detect_force_native,
 715          /* Acer TravelMate 5760 */
 716          .matches = {
 717                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 718                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
 719                 },
 720         },
 721         {
 722          .callback = video_detect_force_native,
 723          /* ASUSTeK COMPUTER INC. GA401 */
 724          .matches = {
 725                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 726                 DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
 727                 },
 728         },
 729         {
 730          .callback = video_detect_force_native,
 731          /* ASUSTeK COMPUTER INC. GA502 */
 732          .matches = {
 733                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 734                 DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
 735                 },
 736         },
 737         {
 738          .callback = video_detect_force_native,
 739          /* ASUSTeK COMPUTER INC. GA503 */
 740          .matches = {
 741                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 742                 DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
 743                 },
 744         },
 745         {
 746          .callback = video_detect_force_native,
 747          /* Asus U46E */
 748          .matches = {
 749                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 750                 DMI_MATCH(DMI_PRODUCT_NAME, "U46E"),
 751                 },
 752         },
 753         {
 754          .callback = video_detect_force_native,
 755          /* Asus UX303UB */
 756          .matches = {
 757                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 758                 DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
 759                 },
 760         },
 761         {
 762          .callback = video_detect_force_native,
 763          /* HP EliteBook 8460p */
 764          .matches = {
 765                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 766                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8460p"),
 767                 },
 768         },
 769         {
 770          .callback = video_detect_force_native,
 771          /* HP Pavilion g6-1d80nr / B4U19UA */
 772          .matches = {
 773                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 774                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
 775                 DMI_MATCH(DMI_PRODUCT_SKU, "B4U19UA"),
 776                 },
 777         },
 778         {
 779          .callback = video_detect_force_native,
 780          /* Samsung N150P */
 781          .matches = {
 782                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 783                 DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
 784                 DMI_MATCH(DMI_BOARD_NAME, "N150P"),
 785                 },
 786         },
 787         {
 788          .callback = video_detect_force_native,
 789          /* Samsung N145P/N250P/N260P */
 790          .matches = {
 791                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 792                 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
 793                 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
 794                 },
 795         },
 796         {
 797          .callback = video_detect_force_native,
 798          /* Samsung N250P */
 799          .matches = {
 800                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 801                 DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
 802                 DMI_MATCH(DMI_BOARD_NAME, "N250P"),
 803                 },
 804         },
 805         {
 806          /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
 807          .callback = video_detect_force_native,
 808          /* Sony Vaio VPCEH3U1E */
 809          .matches = {
 810                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 811                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
 812                 },
 813         },
 814         {
 815          .callback = video_detect_force_native,
 816          /* Sony Vaio VPCY11S1E */
 817          .matches = {
 818                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 819                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
 820                 },
 821         },
 822
 823         /*
 824          * These Toshibas have a broken acpi-video interface for brightness
 825          * control. They also have an issue where the panel is off after
 826          * suspend until a special firmware call is made to turn it back
 827          * on. This is handled by the toshiba_acpi kernel module, so that
 828          * module must be enabled for these models to work correctly.
 829          */
 830         {
 831          /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
 832          .callback = video_detect_force_native,
 833          /* Toshiba Portégé R700 */
 834          .matches = {
 835                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 836                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
 837                 },
 838         },
 839         {
 840          /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
 841          /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
 842          .callback = video_detect_force_native,
 843          /* Toshiba Satellite/Portégé R830 */
 844          .matches = {
 845                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 846                 DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
 847                 },
 848         },
 849         {
 850          .callback = video_detect_force_native,
 851          /* Toshiba Satellite/Portégé Z830 */
 852          .matches = {
 853                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 854                 DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
 855                 },
 856         },
 857
 858         /*
 859          * Dell AIO (All in Ones) which advertise an UART attached backlight
 860          * controller board in their ACPI tables (and may even have one), but
 861          * which need native backlight control nevertheless.
 862          */
 863         {
 864          /* https://github.com/zabbly/linux/issues/26 */
 865          .callback = video_detect_force_native,
 866          /* Dell OptiPlex 5480 AIO */
 867          .matches = {
 868                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 869                 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 5480 AIO"),
 870                 },
 871         },
 872         {
 873          /* https://bugzilla.redhat.com/show_bug.cgi?id=2303936 */
 874          .callback = video_detect_force_native,
 875          /* Dell OptiPlex 7760 AIO */
 876          .matches = {
 877                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 878                 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 7760 AIO"),
 879                 },
 880         },
 881
 882         /*
 883          * Models which have nvidia-ec-wmi support, but should not use it.
 884          * Note this indicates a likely firmware bug on these models and should
 885          * be revisited if/when Linux gets support for dynamic mux mode.
 886          */
 887         {
 888          .callback = video_detect_force_native,
 889          /* Dell G15 5515 */
 890          .matches = {
 891                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 892                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
 893                 },
 894         },
 895         {
 896          .callback = video_detect_force_native,
 897          .matches = {
 898                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 899                 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 15 3535"),
 900                 },
 901         },
 902
 903         /*
 904          * x86 android tablets which directly control the backlight through
 905          * an external backlight controller, typically TI's LP8557.
 906          * The backlight is directly controlled by the lp855x driver on these.
 907          * This setup means that neither i915's native nor acpi_video backlight
 908          * control works. Add a "vendor" quirk to disable both. Note these
 909          * devices do not use vendor control in the typical meaning of
 910          * vendor specific SMBIOS or ACPI calls being used.
 911          */
 912         {
 913          .callback = video_detect_force_vendor,
 914          /* Lenovo Yoga Book X90F / X90L */
 915          .matches = {
 916                 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
 917                 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "CHERRYVIEW D1 PLATFORM"),
 918                 DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "YETI-11"),
 919                 },
 920         },
 921         {
 922          .callback = video_detect_force_vendor,
 923          /*
 924           * Lenovo Yoga Tablet 2 830F/L or 1050F/L (The 8" and 10"
 925           * Lenovo Yoga Tablet 2 use the same mainboard)
 926           */
 927          .matches = {
 928                 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corp."),
 929                 DMI_MATCH(DMI_PRODUCT_NAME, "VALLEYVIEW C0 PLATFORM"),
 930                 DMI_MATCH(DMI_BOARD_NAME, "BYT-T FFD8"),
 931                 /* Partial match on beginning of BIOS version */
 932                 DMI_MATCH(DMI_BIOS_VERSION, "BLADE_21"),
 933                 },
 934         },
 935         {
 936          .callback = video_detect_force_vendor,
 937          /* Lenovo Yoga Tab 3 Pro YT3-X90F */
 938          .matches = {
 939                 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
 940                 DMI_MATCH(DMI_PRODUCT_VERSION, "Blade3-10A-001"),
 941                 },
 942         },
 943         {
 944          .callback = video_detect_force_vendor,
 945          /* Xiaomi Mi Pad 2 */
 946          .matches = {
 947                 DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
 948                 DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
 949                 },
 950         },
 951         { },
 952 };
 953
 954 static bool google_cros_ec_present(void)
 955 {
 956         return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
 957 }
 958
 959 /*
 960  * Windows 8 and newer no longer use the ACPI video interface, so it often
 961  * does not work. So on win8+ systems prefer native brightness control.
 962  * Chromebooks should always prefer native backlight control.
 963  */
 964 static bool prefer_native_over_acpi_video(void)
 965 {
 966         return acpi_osi_is_win8() || google_cros_ec_present();
 967 }
 968
 969 /*
 970  * Determine which type of backlight interface to use on this system,
 971  * First check cmdline, then dmi quirks, then do autodetect.
 972  */
 973 enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto_detect)
 974 {
 975         static DEFINE_MUTEX(init_mutex);
 976         static bool nvidia_wmi_ec_present;
 977         static bool apple_gmux_present;
 978         static bool dell_uart_present;
 979         static bool native_available;
 980         static bool init_done;
 981         static long video_caps;
 982
 983         /* Parse cmdline, dmi and acpi only once */
 984         mutex_lock(&init_mutex);
 985         if (!init_done) {
 986                 acpi_video_parse_cmdline();
 987                 dmi_check_system(video_detect_dmi_table);
 988                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 989                                     ACPI_UINT32_MAX, find_video, NULL,
 990                                     &video_caps, NULL);
 991                 nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
 992                 apple_gmux_present = apple_gmux_detect(NULL, NULL);
 993                 dell_uart_present = acpi_dev_present("DELL0501", NULL, -1);
 994                 init_done = true;
 995         }
 996         if (native)
 997                 native_available = true;
 998         mutex_unlock(&init_mutex);
 999
1000         if (auto_detect)
1001                 *auto_detect = false;
1002
1003         /*
1004          * The below heuristics / detection steps are in order of descending
1005          * presedence. The commandline takes presedence over anything else.
1006          */
1007         if (acpi_backlight_cmdline != acpi_backlight_undef)
1008                 return acpi_backlight_cmdline;
1009
1010         /* DMI quirks override any autodetection. */
1011         if (acpi_backlight_dmi != acpi_backlight_undef)
1012                 return acpi_backlight_dmi;
1013
1014         if (auto_detect)
1015                 *auto_detect = true;
1016
1017         /* Special cases such as nvidia_wmi_ec and apple gmux. */
1018         if (nvidia_wmi_ec_present)
1019                 return acpi_backlight_nvidia_wmi_ec;
1020
1021         if (apple_gmux_present)
1022                 return acpi_backlight_apple_gmux;
1023
1024         if (dell_uart_present)
1025                 return acpi_backlight_dell_uart;
1026
1027         /* Use ACPI video if available, except when native should be preferred. */
1028         if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
1029              !(native_available && prefer_native_over_acpi_video()))
1030                 return acpi_backlight_video;
1031
1032         /* Use native if available */
1033         if (native_available)
1034                 return acpi_backlight_native;
1035
1036         /*
1037          * The vendor specific BIOS interfaces are only necessary for
1038          * laptops from before ~2008.
1039          *
1040          * For laptops from ~2008 till ~2023 this point is never reached
1041          * because on those (video_caps & ACPI_VIDEO_BACKLIGHT) above is true.
1042          *
1043          * Laptops from after ~2023 no longer support ACPI_VIDEO_BACKLIGHT,
1044          * if this point is reached on those, this likely means that
1045          * the GPU kms driver which sets native_available has not loaded yet.
1046          *
1047          * Returning acpi_backlight_vendor in this case is known to sometimes
1048          * cause a non working vendor specific /sys/class/backlight device to
1049          * get registered.
1050          *
1051          * Return acpi_backlight_none on laptops with ACPI tables written
1052          * for Windows 8 (laptops from after ~2012) to avoid this problem.
1053          */
1054         if (acpi_osi_is_win8())
1055                 return acpi_backlight_none;
1056
1057         /* No ACPI video/native (old hw), use vendor specific fw methods. */
1058         return acpi_backlight_vendor;
1059 }
1060 EXPORT_SYMBOL(__acpi_video_get_backlight_type);