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 On CPU models which support it, TjMax is read from a model-specific register.
  46 On other models, it is set to an arbitrary value based on weak heuristics.
  47 If these heuristics don't work for you, you can pass the correct TjMax value
  48 as a module parameter (tjmax).
  49
  50 Appendix A. Known TjMax lists (TBD):
  51 Some information comes from ark.intel.com
  52
  53 Process         Processor                                       TjMax(C)
  54
  55 32nm            Core i3/i5/i7 Processors
  56                 i7 660UM/640/620, 640LM/620, 620M, 610E         105
  57                 i5 540UM/520/430, 540M/520/450/430              105
  58                 i3 330E, 370M/350/330                           90 rPGA, 105 BGA
  59                 i3 330UM                                        105
  60
  61 32nm            Core i7 Extreme Processors
  62                 980X                                            100
  63
  64 32nm            Celeron Processors
  65                 U3400                                           105
  66                 P4505/P4500                                     90
  67
  68 45nm            Xeon Processors 5400 Quad-Core
  69                 X5492, X5482, X5472, X5470, X5460, X5450        85
  70                 E5472, E5462, E5450/40/30/20/10/05              85
  71                 L5408                                           95
  72                 L5430, L5420, L5410                             70
  73
  74 45nm            Xeon Processors 5200 Dual-Core
  75                 X5282, X5272, X5270, X5260                      90
  76                 E5240                                           90
  77                 E5205, E5220                                    70, 90
  78                 L5240                                           70
  79                 L5238, L5215                                    95
  80
  81 45nm            Atom Processors
  82                 D525/510/425/410                                100
  83                 Z560/550/540/530P/530/520PT/520/515/510PT/510P  90
  84                 Z510/500                                        90
  85                 N475/470/455/450                                100
  86                 N280/270                                        90
  87                 330/230                                         125
  88
  89 45nm            Core2 Processors
  90                 Solo ULV SU3500/3300                            100
  91                 T9900/9800/9600/9550/9500/9400/9300/8300/8100   105
  92                 T6670/6500/6400                                 105
  93                 T6600                                           90
  94                 SU9600/9400/9300                                105
  95                 SP9600/9400                                     105
  96                 SL9600/9400/9380/9300                           105
  97                 P9700/9600/9500/8800/8700/8600/8400/7570        105
  98                 P7550/7450                                      90
  99
 100 45nm            Core2 Quad Processors
 101                 Q9100/9000                                      100
 102
 103 45nm            Core2 Extreme Processors
 104                 X9100/9000                                      105
 105                 QX9300                                          100
 106
 107 45nm            Core i3/i5/i7 Processors
 108                 i7 940XM/920                                    100
 109                 i7 840QM/820/740/720                            100
 110
 111 45nm            Celeron Processors
 112                 SU2300                                          100
 113                 900                                             105
 114
 115 65nm            Core2 Duo Processors
 116                 Solo U2200, U2100                               100
 117                 U7700/7600/7500                                 100
 118                 T7800/7700/7600/7500/7400/7300/7250/7200/7100   100
 119                 T5870/5670/5600/5550/5500/5470/5450/5300/5270   100
 120                 T5250                                           100
 121                 T5800/5750/5200                                 85
 122                 L7700/7500/7400/7300/7200                       100
 123
 124 65nm            Core2 Extreme Processors
 125                 X7900/7800                                      100
 126
 127 65nm            Core Duo Processors
 128                 U2500/2400                                      100
 129                 T2700/2600/2450/2400/2350/2300E/2300/2250/2050  100
 130                 L2500/2400/2300                                 100
 131
 132 65nm            Core Solo Processors
 133                 U1500/1400/1300                                 100
 134                 T1400/1350/1300/1250                            100
 135
 136 65nm            Xeon Processors 5000 Quad-Core
 137                 X5000                                           90-95
 138                 E5000                                           80
 139                 L5000                                           70
 140                 L5318                                           95
 141
 142 65nm            Xeon Processors 5000 Dual-Core
 143                 5080, 5063, 5060, 5050, 5030                    80-90
 144                 5160, 5150, 5148, 5140, 5130, 5120, 5110        80
 145                 L5138                                           100
 146
 147 65nm            Celeron Processors
 148                 T1700/1600                                      100
 149                 560/550/540/530                                 100