Documentation/hwmon/coretemp.rst

   1 Kernel driver coretemp
   2 ======================
   3
   4 Supported chips:
   5   * All Intel Core family
   6
   7     Prefix: 'coretemp'
   8
   9     CPUID: family 0x6, models
  10
  11                             - 0xe (Pentium M DC), 0xf (Core 2 DC 65nm),
  12                             - 0x16 (Core 2 SC 65nm), 0x17 (Penryn 45nm),
  13                             - 0x1a (Nehalem), 0x1c (Atom), 0x1e (Lynnfield),
  14                             - 0x26 (Tunnel Creek Atom), 0x27 (Medfield Atom),
  15                             - 0x36 (Cedar Trail Atom)
  16
  17     Datasheet:
  18
  19                Intel 64 and IA-32 Architectures Software Developer's Manual
  20                Volume 3A: System Programming Guide
  21
  22                http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
  23
  24 Author: Rudolf Marek
  25
  26 Description
  27 -----------
  28
  29 This driver permits reading the DTS (Digital Temperature Sensor) embedded
  30 inside Intel CPUs. This driver can read both the per-core and per-package
  31 temperature using the appropriate sensors. The per-package sensor is new;
  32 as of now, it is present only in the SandyBridge platform. The driver will
  33 show the temperature of all cores inside a package under a single device
  34 directory inside hwmon.
  35
  36 Temperature is measured in degrees Celsius and measurement resolution is
  37 1 degree C. Valid temperatures are from 0 to TjMax degrees C, because
  38 the actual value of temperature register is in fact a delta from TjMax.
  39
  40 Temperature known as TjMax is the maximum junction temperature of processor,
  41 which depends on the CPU model. See table below. At this temperature, protection
  42 mechanism will perform actions to forcibly cool down the processor. Alarm
  43 may be raised, if the temperature grows enough (more than TjMax) to trigger
  44 the Out-Of-Spec bit. Following table summarizes the exported sysfs files:
  45
  46 All Sysfs entries are named with their core_id (represented here by 'X').
  47
  48 ================= ========================================================
  49 tempX_input       Core temperature (in millidegrees Celsius).
  50 tempX_max         All cooling devices should be turned on (on Core2).
  51 tempX_crit        Maximum junction temperature (in millidegrees Celsius).
  52 tempX_crit_alarm  Set when Out-of-spec bit is set, never clears.
  53                   Correct CPU operation is no longer guaranteed.
  54 tempX_label       Contains string "Core X", where X is processor
  55                   number. For Package temp, this will be "Physical id Y",
  56                   where Y is the package number.
  57 ================= ========================================================
  58
  59 On CPU models which support it, TjMax is read from a model-specific register.
  60 On other models, it is set to an arbitrary value based on weak heuristics.
  61 If these heuristics don't work for you, you can pass the correct TjMax value
  62 as a module parameter (tjmax).
  63
  64 Appendix A. Known TjMax lists (TBD):
  65 Some information comes from ark.intel.com
  66
  67 =============== =============================================== ================
  68 Process         Processor                                       TjMax(C)
  69
  70 22nm            Core i5/i7 Processors
  71                 i7 3920XM, 3820QM, 3720QM, 3667U, 3520M         105
  72                 i5 3427U, 3360M/3320M                           105
  73                 i7 3770/3770K                                   105
  74                 i5 3570/3570K, 3550, 3470/3450                  105
  75                 i7 3770S                                        103
  76                 i5 3570S/3550S, 3475S/3470S/3450S               103
  77                 i7 3770T                                        94
  78                 i5 3570T                                        94
  79                 i5 3470T                                        91
  80
  81 32nm            Core i3/i5/i7 Processors
  82                 i7 2600                                         98
  83                 i7 660UM/640/620, 640LM/620, 620M, 610E         105
  84                 i5 540UM/520/430, 540M/520/450/430              105
  85                 i3 330E, 370M/350/330                           90 rPGA, 105 BGA
  86                 i3 330UM                                        105
  87
  88 32nm            Core i7 Extreme Processors
  89                 980X                                            100
  90
  91 32nm            Celeron Processors
  92                 U3400                                           105
  93                 P4505/P4500                                     90
  94
  95 32nm            Atom Processors
  96                 S1260/1220                                      95
  97                 S1240                                           102
  98                 Z2460                                           90
  99                 Z2760                                           90
 100                 D2700/2550/2500                                 100
 101                 N2850/2800/2650/2600                            100
 102
 103 45nm            Xeon Processors 5400 Quad-Core
 104                 X5492, X5482, X5472, X5470, X5460, X5450        85
 105                 E5472, E5462, E5450/40/30/20/10/05              85
 106                 L5408                                           95
 107                 L5430, L5420, L5410                             70
 108
 109 45nm            Xeon Processors 5200 Dual-Core
 110                 X5282, X5272, X5270, X5260                      90
 111                 E5240                                           90
 112                 E5205, E5220                                    70, 90
 113                 L5240                                           70
 114                 L5238, L5215                                    95
 115
 116 45nm            Atom Processors
 117                 D525/510/425/410                                100
 118                 K525/510/425/410                                100
 119                 Z670/650                                        90
 120                 Z560/550/540/530P/530/520PT/520/515/510PT/510P  90
 121                 Z510/500                                        90
 122                 N570/550                                        100
 123                 N475/470/455/450                                100
 124                 N280/270                                        90
 125                 330/230                                         125
 126                 E680/660/640/620                                90
 127                 E680T/660T/640T/620T                            110
 128                 E665C/645C                                      90
 129                 E665CT/645CT                                    110
 130                 CE4170/4150/4110                                110
 131                 CE4200 series                                   unknown
 132                 CE5300 series                                   unknown
 133
 134 45nm            Core2 Processors
 135                 Solo ULV SU3500/3300                            100
 136                 T9900/9800/9600/9550/9500/9400/9300/8300/8100   105
 137                 T6670/6500/6400                                 105
 138                 T6600                                           90
 139                 SU9600/9400/9300                                105
 140                 SP9600/9400                                     105
 141                 SL9600/9400/9380/9300                           105
 142                 P9700/9600/9500/8800/8700/8600/8400/7570        105
 143                 P7550/7450                                      90
 144
 145 45nm            Core2 Quad Processors
 146                 Q9100/9000                                      100
 147
 148 45nm            Core2 Extreme Processors
 149                 X9100/9000                                      105
 150                 QX9300                                          100
 151
 152 45nm            Core i3/i5/i7 Processors
 153                 i7 940XM/920                                    100
 154                 i7 840QM/820/740/720                            100
 155
 156 45nm            Celeron Processors
 157                 SU2300                                          100
 158                 900                                             105
 159
 160 65nm            Core2 Duo Processors
 161                 Solo U2200, U2100                               100
 162                 U7700/7600/7500                                 100
 163                 T7800/7700/7600/7500/7400/7300/7250/7200/7100   100
 164                 T5870/5670/5600/5550/5500/5470/5450/5300/5270   100
 165                 T5250                                           100
 166                 T5800/5750/5200                                 85
 167                 L7700/7500/7400/7300/7200                       100
 168
 169 65nm            Core2 Extreme Processors
 170                 X7900/7800                                      100
 171
 172 65nm            Core Duo Processors
 173                 U2500/2400                                      100
 174                 T2700/2600/2450/2400/2350/2300E/2300/2250/2050  100
 175                 L2500/2400/2300                                 100
 176
 177 65nm            Core Solo Processors
 178                 U1500/1400/1300                                 100
 179                 T1400/1350/1300/1250                            100
 180
 181 65nm            Xeon Processors 5000 Quad-Core
 182                 X5000                                           90-95
 183                 E5000                                           80
 184                 L5000                                           70
 185                 L5318                                           95
 186
 187 65nm            Xeon Processors 5000 Dual-Core
 188                 5080, 5063, 5060, 5050, 5030                    80-90
 189                 5160, 5150, 5148, 5140, 5130, 5120, 5110        80
 190                 L5138                                           100
 191
 192 65nm            Celeron Processors
 193                 T1700/1600                                      100
 194                 560/550/540/530                                 100
 195 =============== =============================================== ================