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                    Initialized with IA32_THERM_INTERRUPT. When the CPU
  39                    temperature reaches this temperature, an interrupt is
  40                    generated and tempX_max_alarm is set.
  41 tempX_max_hyst   - If the CPU temperature falls below than temperature,
  42                    an interrupt is generated and tempX_max_alarm is reset.
  43 tempX_max_alarm  - Set if the temperature reaches or exceeds tempX_max.
  44                    Reset if the temperature drops to or below tempX_max_hyst.
  45 tempX_crit       - Maximum junction temperature (in millidegrees Celsius).
  46 tempX_crit_alarm - Set when Out-of-spec bit is set, never clears.
  47                    Correct CPU operation is no longer guaranteed.
  48 tempX_label      - Contains string "Core X", where X is processor
  49                    number. For Package temp, this will be "Physical id Y",
  50                    where Y is the package number.
  51
  52 The TjMax temperature is set to 85 degrees C if undocumented model specific
  53 register (UMSR) 0xee has bit 30 set. If not the TjMax is 100 degrees C as
  54 (sometimes) documented in processor datasheet.
  55
  56 Appendix A. Known TjMax lists (TBD):
  57 Some information comes from ark.intel.com
  58
  59 Process         Processor                                       TjMax(C)
  60
  61 32nm            Core i3/i5/i7 Processors
  62                 i7 660UM/640/620, 640LM/620, 620M, 610E         105
  63                 i5 540UM/520/430, 540M/520/450/430              105
  64                 i3 330E, 370M/350/330                           90 rPGA, 105 BGA
  65                 i3 330UM                                        105
  66
  67 32nm            Core i7 Extreme Processors
  68                 980X                                            100
  69
  70 32nm            Celeron Processors
  71                 U3400                                           105
  72                 P4505/P4500                                     90
  73
  74 45nm            Xeon Processors 5400 Quad-Core
  75                 X5492, X5482, X5472, X5470, X5460, X5450        85
  76                 E5472, E5462, E5450/40/30/20/10/05              85
  77                 L5408                                           95
  78                 L5430, L5420, L5410                             70
  79
  80 45nm            Xeon Processors 5200 Dual-Core
  81                 X5282, X5272, X5270, X5260                      90
  82                 E5240                                           90
  83                 E5205, E5220                                    70, 90
  84                 L5240                                           70
  85                 L5238, L5215                                    95
  86
  87 45nm            Atom Processors
  88                 D525/510/425/410                                100
  89                 Z560/550/540/530P/530/520PT/520/515/510PT/510P  90
  90                 Z510/500                                        90
  91                 N475/470/455/450                                100
  92                 N280/270                                        90
  93                 330/230                                         125
  94
  95 45nm            Core2 Processors
  96                 Solo ULV SU3500/3300                            100
  97                 T9900/9800/9600/9550/9500/9400/9300/8300/8100   105
  98                 T6670/6500/6400                                 105
  99                 T6600                                           90
 100                 SU9600/9400/9300                                105
 101                 SP9600/9400                                     105
 102                 SL9600/9400/9380/9300                           105
 103                 P9700/9600/9500/8800/8700/8600/8400/7570        105
 104                 P7550/7450                                      90
 105
 106 45nm            Core2 Quad Processors
 107                 Q9100/9000                                      100
 108
 109 45nm            Core2 Extreme Processors
 110                 X9100/9000                                      105
 111                 QX9300                                          100
 112
 113 45nm            Core i3/i5/i7 Processors
 114                 i7 940XM/920                                    100
 115                 i7 840QM/820/740/720                            100
 116
 117 45nm            Celeron Processors
 118                 SU2300                                          100
 119                 900                                             105
 120
 121 65nm            Core2 Duo Processors
 122                 Solo U2200, U2100                               100
 123                 U7700/7600/7500                                 100
 124                 T7800/7700/7600/7500/7400/7300/7250/7200/7100   100
 125                 T5870/5670/5600/5550/5500/5470/5450/5300/5270   100
 126                 T5250                                           100
 127                 T5800/5750/5200                                 85
 128                 L7700/7500/7400/7300/7200                       100
 129
 130 65nm            Core2 Extreme Processors
 131                 X7900/7800                                      100
 132
 133 65nm            Core Duo Processors
 134                 U2500/2400                                      100
 135                 T2700/2600/2450/2400/2350/2300E/2300/2250/2050  100
 136                 L2500/2400/2300                                 100
 137
 138 65nm            Core Solo Processors
 139                 U1500/1400/1300                                 100
 140                 T1400/1350/1300/1250                            100
 141
 142 65nm            Xeon Processors 5000 Quad-Core
 143                 X5000                                           90-95
 144                 E5000                                           80
 145                 L5000                                           70
 146                 L5318                                           95
 147
 148 65nm            Xeon Processors 5000 Dual-Core
 149                 5080, 5063, 5060, 5050, 5030                    80-90
 150                 5160, 5150, 5148, 5140, 5130, 5120, 5110        80
 151                 L5138                                           100
 152
 153 65nm            Celeron Processors
 154                 T1700/1600                                      100
 155                 560/550/540/530                                 100