1 Acer Laptop WMI Extras Driver
2 http://code.google.com/p/aceracpi
6 Copyright 2007-2009 Carlos Corbacho <carlos@strangeworlds.co.uk>
8 acer-wmi is a driver to allow you to control various parts of your Acer laptop
9 hardware under Linux which are exposed via ACPI-WMI.
11 This driver completely replaces the old out-of-tree acer_acpi, which I am
12 currently maintaining for bug fixes only on pre-2.6.25 kernels. All development
13 work is now focused solely on acer-wmi.
18 Acer and Wistron have provided nothing towards the development acer_acpi or
19 acer-wmi. All information we have has been through the efforts of the developers
20 and the users to discover as much as possible about the hardware.
22 As such, I do warn that this could break your hardware - this is extremely
23 unlikely of course, but please bear this in mind.
28 acer-wmi is derived from acer_acpi, originally developed by Mark
29 Smith in 2005, then taken over by Carlos Corbacho in 2007, in order to activate
30 the wireless LAN card under a 64-bit version of Linux, as acerhk[1] (the
31 previous solution to the problem) relied on making 32 bit BIOS calls which are
32 not possible in kernel space from a 64 bit OS.
34 [1] acerhk: http://www.cakey.de/acerhk/
39 NOTE: The Acer Aspire One is not supported hardware. It cannot work with
40 acer-wmi until Acer fix their ACPI-WMI implementation on them, so has been
41 blacklisted until that happens.
43 Please see the website for the current list of known working hardware:
45 http://code.google.com/p/aceracpi/wiki/SupportedHardware
47 If your laptop is not listed, or listed as unknown, and works with acer-wmi,
48 please contact me with a copy of the DSDT.
50 If your Acer laptop doesn't work with acer-wmi, I would also like to see the
53 To send me the DSDT, as root/sudo:
55 cat /sys/firmware/acpi/tables/DSDT > dsdt
57 And send me the resulting 'dsdt' file.
62 On Acer laptops, acer-wmi should already be autoloaded based on DMI matching.
63 For non-Acer laptops, until WMI based autoloading support is added, you will
64 need to manually load acer-wmi.
66 acer-wmi creates /sys/devices/platform/acer-wmi, and fills it with various
67 files whose usage is detailed below, which enables you to control some of the
68 following (varies between models):
70 * the wireless LAN card radio
71 * inbuilt Bluetooth adapter
73 * mail LED of your laptop
74 * brightness of the LCD panel
79 With regards to wireless, all acer-wmi does is enable the radio on the card. It
80 is not responsible for the wireless LED - once the radio is enabled, this is
81 down to the wireless driver for your card. So the behaviour of the wireless LED,
82 once you enable the radio, will depend on your hardware and driver combination.
84 e.g. With the BCM4318 on the Acer Aspire 5020 series:
86 ndiswrapper: Light blinks on when transmitting
87 b43: Solid light, blinks off when transmitting
89 Wireless radio control is unconditionally enabled - all Acer laptops that support
90 acer-wmi come with built-in wireless. However, should you feel so inclined to
91 ever wish to remove the card, or swap it out at some point, please get in touch
92 with me, as we may well be able to gain some data on wireless card detection.
94 The wireless radio is exposed through rfkill.
99 For bluetooth, this is an internal USB dongle, so once enabled, you will get
100 a USB device connection event, and a new USB device appears. When you disable
101 bluetooth, you get the reverse - a USB device disconnect event, followed by the
102 device disappearing again.
104 Bluetooth is autodetected by acer-wmi, so if you do not have a bluetooth module
105 installed in your laptop, this file won't exist (please be aware that it is
106 quite common for Acer not to fit bluetooth to their laptops - so just because
107 you have a bluetooth button on the laptop, doesn't mean that bluetooth is
110 For the adventurously minded - if you want to buy an internal bluetooth
111 module off the internet that is compatible with your laptop and fit it, then
112 it will work just fine with acer-wmi.
114 Bluetooth is exposed through rfkill.
119 3G is currently not autodetected, so the 'threeg' file is always created under
120 sysfs. So far, no-one in possession of an Acer laptop with 3G built-in appears to
121 have tried Linux, or reported back, so we don't have any information on this.
123 If you have an Acer laptop that does have a 3G card in, please contact me so we
124 can properly detect these, and find out a bit more about them.
126 To read the status of the 3G card (0=off, 1=on):
127 cat /sys/devices/platform/acer-wmi/threeg
129 To enable the 3G card:
130 echo 1 > /sys/devices/platform/acer-wmi/threeg
132 To disable the 3G card:
133 echo 0 > /sys/devices/platform/acer-wmi/threeg
135 To set the state of the 3G card when loading acer-wmi, pass:
136 threeg=X (where X is 0 or 1)
141 This can be found in most older Acer laptops supported by acer-wmi, and many
142 newer ones - it is built into the 'mail' button, and blinks when active.
144 On newer (WMID) laptops though, we have no way of detecting the mail LED. If
145 your laptop identifies itself in dmesg as a WMID model, then please try loading
150 This will use a known alternative method of reading/ writing the mail LED. If
151 it works, please report back to me with the DMI data from your laptop so this
152 can be added to acer-wmi.
154 The LED is exposed through the LED subsystem, and can be found in:
156 /sys/devices/platform/acer-wmi/leds/acer-wmi::mail/
158 The mail LED is autodetected, so if you don't have one, the LED device won't
164 The backlight brightness control is available on all acer-wmi supported
165 hardware. The maximum brightness level is usually 15, but on some newer laptops
166 it's 10 (this is again autodetected).
168 The backlight is exposed through the backlight subsystem, and can be found in:
170 /sys/devices/platform/acer-wmi/backlight/acer-wmi/
175 Olaf Tauber, who did the real hard work when he developed acerhk
176 http://www.informatik.hu-berlin.de/~tauber/acerhk
177 All the authors of laptop ACPI modules in the kernel, whose work
178 was an inspiration in the early days of acer_acpi
179 Mathieu Segaud, who solved the problem with having to modprobe the driver
180 twice in acer_acpi 0.2.
181 Jim Ramsay, who added support for the WMID interface
182 Mark Smith, who started the original acer_acpi
184 And the many people who have used both acer_acpi and acer-wmi.