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 22nm            Core i5/i7 Processors
  58                 i7 3920XM, 3820QM, 3720QM, 3667U, 3520M         105
  59                 i5 3427U, 3360M/3320M                           105
  60                 i7 3770/3770K                                   105
  61                 i5 3570/3570K, 3550, 3470/3450                  105
  62                 i7 3770S                                        103
  63                 i5 3570S/3550S, 3475S/3470S/3450S               103
  64                 i7 3770T                                        94
  65                 i5 3570T                                        94
  66                 i5 3470T                                        91
  67
  68 32nm            Core i3/i5/i7 Processors
  69                 i7 660UM/640/620, 640LM/620, 620M, 610E         105
  70                 i5 540UM/520/430, 540M/520/450/430              105
  71                 i3 330E, 370M/350/330                           90 rPGA, 105 BGA
  72                 i3 330UM                                        105
  73
  74 32nm            Core i7 Extreme Processors
  75                 980X                                            100
  76
  77 32nm            Celeron Processors
  78                 U3400                                           105
  79                 P4505/P4500                                     90
  80
  81 32nm            Atom Processors
  82                 Z2460                                           90
  83                 D2700/2550/2500                                 100
  84                 N2850/2800/2650/2600                            100
  85
  86 45nm            Xeon Processors 5400 Quad-Core
  87                 X5492, X5482, X5472, X5470, X5460, X5450        85
  88                 E5472, E5462, E5450/40/30/20/10/05              85
  89                 L5408                                           95
  90                 L5430, L5420, L5410                             70
  91
  92 45nm            Xeon Processors 5200 Dual-Core
  93                 X5282, X5272, X5270, X5260                      90
  94                 E5240                                           90
  95                 E5205, E5220                                    70, 90
  96                 L5240                                           70
  97                 L5238, L5215                                    95
  98
  99 45nm            Atom Processors
 100                 D525/510/425/410                                100
 101                 Z560/550/540/530P/530/520PT/520/515/510PT/510P  90
 102                 Z510/500                                        90
 103                 N475/470/455/450                                100
 104                 N280/270                                        90
 105                 330/230                                         125
 106                 E680/660/640/620                                90
 107                 E680T/660T/640T/620T                            110
 108
 109 45nm            Core2 Processors
 110                 Solo ULV SU3500/3300                            100
 111                 T9900/9800/9600/9550/9500/9400/9300/8300/8100   105
 112                 T6670/6500/6400                                 105
 113                 T6600                                           90
 114                 SU9600/9400/9300                                105
 115                 SP9600/9400                                     105
 116                 SL9600/9400/9380/9300                           105
 117                 P9700/9600/9500/8800/8700/8600/8400/7570        105
 118                 P7550/7450                                      90
 119
 120 45nm            Core2 Quad Processors
 121                 Q9100/9000                                      100
 122
 123 45nm            Core2 Extreme Processors
 124                 X9100/9000                                      105
 125                 QX9300                                          100
 126
 127 45nm            Core i3/i5/i7 Processors
 128                 i7 940XM/920                                    100
 129                 i7 840QM/820/740/720                            100
 130
 131 45nm            Celeron Processors
 132                 SU2300                                          100
 133                 900                                             105
 134
 135 65nm            Core2 Duo Processors
 136                 Solo U2200, U2100                               100
 137                 U7700/7600/7500                                 100
 138                 T7800/7700/7600/7500/7400/7300/7250/7200/7100   100
 139                 T5870/5670/5600/5550/5500/5470/5450/5300/5270   100
 140                 T5250                                           100
 141                 T5800/5750/5200                                 85
 142                 L7700/7500/7400/7300/7200                       100
 143
 144 65nm            Core2 Extreme Processors
 145                 X7900/7800                                      100
 146
 147 65nm            Core Duo Processors
 148                 U2500/2400                                      100
 149                 T2700/2600/2450/2400/2350/2300E/2300/2250/2050  100
 150                 L2500/2400/2300                                 100
 151
 152 65nm            Core Solo Processors
 153                 U1500/1400/1300                                 100
 154                 T1400/1350/1300/1250                            100
 155
 156 65nm            Xeon Processors 5000 Quad-Core
 157                 X5000                                           90-95
 158                 E5000                                           80
 159                 L5000                                           70
 160                 L5318                                           95
 161
 162 65nm            Xeon Processors 5000 Dual-Core
 163                 5080, 5063, 5060, 5050, 5030                    80-90
 164                 5160, 5150, 5148, 5140, 5130, 5120, 5110        80
 165                 L5138                                           100
 166
 167 65nm            Celeron Processors
 168                 T1700/1600                                      100
 169                 560/550/540/530                                 100