Documentation/hwmon/coretemp

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