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