Kernel driver coretemp
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======================
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Supported chips:
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* All Intel Core family
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Prefix: 'coretemp'
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CPUID: family 0x6, models
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- 0xe (Pentium M DC), 0xf (Core 2 DC 65nm),
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- 0x16 (Core 2 SC 65nm), 0x17 (Penryn 45nm),
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- 0x1a (Nehalem), 0x1c (Atom), 0x1e (Lynnfield),
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- 0x26 (Tunnel Creek Atom), 0x27 (Medfield Atom),
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- 0x36 (Cedar Trail Atom)
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Datasheet:
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Intel 64 and IA-32 Architectures Software Developer's Manual
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Volume 3A: System Programming Guide
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http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
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Author: Rudolf Marek
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Description
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-----------
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This driver permits reading the DTS (Digital Temperature Sensor) embedded
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inside Intel CPUs. This driver can read both the per-core and per-package
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temperature using the appropriate sensors. The per-package sensor is new;
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as of now, it is present only in the SandyBridge platform. The driver will
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show the temperature of all cores inside a package under a single device
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directory inside hwmon.
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Temperature is measured in degrees Celsius and measurement resolution is
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1 degree C. Valid temperatures are from 0 to TjMax degrees C, because
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the actual value of temperature register is in fact a delta from TjMax.
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Temperature known as TjMax is the maximum junction temperature of processor,
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which depends on the CPU model. See table below. At this temperature, protection
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mechanism will perform actions to forcibly cool down the processor. Alarm
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may be raised, if the temperature grows enough (more than TjMax) to trigger
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the Out-Of-Spec bit. Following table summarizes the exported sysfs files:
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All Sysfs entries are named with their core_id (represented here by 'X').
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================= ========================================================
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tempX_input Core temperature (in millidegrees Celsius).
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tempX_max All cooling devices should be turned on (on Core2).
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tempX_crit Maximum junction temperature (in millidegrees Celsius).
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tempX_crit_alarm Set when Out-of-spec bit is set, never clears.
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Correct CPU operation is no longer guaranteed.
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tempX_label Contains string "Core X", where X is processor
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number. For Package temp, this will be "Physical id Y",
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where Y is the package number.
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================= ========================================================
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On CPU models which support it, TjMax is read from a model-specific register.
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On other models, it is set to an arbitrary value based on weak heuristics.
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If these heuristics don't work for you, you can pass the correct TjMax value
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as a module parameter (tjmax).
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Appendix A. Known TjMax lists (TBD):
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Some information comes from ark.intel.com
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=============== =============================================== ================
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Process Processor TjMax(C)
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22nm Core i5/i7 Processors
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i7 3920XM, 3820QM, 3720QM, 3667U, 3520M 105
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i5 3427U, 3360M/3320M 105
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i7 3770/3770K 105
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i5 3570/3570K, 3550, 3470/3450 105
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i7 3770S 103
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i5 3570S/3550S, 3475S/3470S/3450S 103
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i7 3770T 94
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i5 3570T 94
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i5 3470T 91
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32nm Core i3/i5/i7 Processors
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i7 2600 98
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i7 660UM/640/620, 640LM/620, 620M, 610E 105
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i5 540UM/520/430, 540M/520/450/430 105
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i3 330E, 370M/350/330 90 rPGA, 105 BGA
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i3 330UM 105
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32nm Core i7 Extreme Processors
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980X 100
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32nm Celeron Processors
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U3400 105
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P4505/P4500 90
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32nm Atom Processors
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S1260/1220 95
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S1240 102
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Z2460 90
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Z2760 90
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D2700/2550/2500 100
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N2850/2800/2650/2600 100
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45nm Xeon Processors 5400 Quad-Core
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X5492, X5482, X5472, X5470, X5460, X5450 85
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E5472, E5462, E5450/40/30/20/10/05 85
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L5408 95
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L5430, L5420, L5410 70
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45nm Xeon Processors 5200 Dual-Core
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X5282, X5272, X5270, X5260 90
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E5240 90
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E5205, E5220 70, 90
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L5240 70
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L5238, L5215 95
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45nm Atom Processors
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D525/510/425/410 100
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K525/510/425/410 100
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Z670/650 90
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Z560/550/540/530P/530/520PT/520/515/510PT/510P 90
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Z510/500 90
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N570/550 100
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N475/470/455/450 100
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N280/270 90
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330/230 125
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E680/660/640/620 90
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E680T/660T/640T/620T 110
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E665C/645C 90
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E665CT/645CT 110
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CE4170/4150/4110 110
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CE4200 series unknown
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CE5300 series unknown
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45nm Core2 Processors
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Solo ULV SU3500/3300 100
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T9900/9800/9600/9550/9500/9400/9300/8300/8100 105
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T6670/6500/6400 105
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T6600 90
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SU9600/9400/9300 105
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SP9600/9400 105
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SL9600/9400/9380/9300 105
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P9700/9600/9500/8800/8700/8600/8400/7570 105
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P7550/7450 90
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45nm Core2 Quad Processors
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Q9100/9000 100
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45nm Core2 Extreme Processors
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X9100/9000 105
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QX9300 100
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45nm Core i3/i5/i7 Processors
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i7 940XM/920 100
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i7 840QM/820/740/720 100
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45nm Celeron Processors
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SU2300 100
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900 105
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65nm Core2 Duo Processors
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Solo U2200, U2100 100
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U7700/7600/7500 100
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T7800/7700/7600/7500/7400/7300/7250/7200/7100 100
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T5870/5670/5600/5550/5500/5470/5450/5300/5270 100
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T5250 100
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T5800/5750/5200 85
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L7700/7500/7400/7300/7200 100
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65nm Core2 Extreme Processors
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X7900/7800 100
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65nm Core Duo Processors
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U2500/2400 100
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T2700/2600/2450/2400/2350/2300E/2300/2250/2050 100
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L2500/2400/2300 100
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65nm Core Solo Processors
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U1500/1400/1300 100
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T1400/1350/1300/1250 100
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65nm Xeon Processors 5000 Quad-Core
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X5000 90-95
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E5000 80
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L5000 70
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L5318 95
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65nm Xeon Processors 5000 Dual-Core
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5080, 5063, 5060, 5050, 5030 80-90
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5160, 5150, 5148, 5140, 5130, 5120, 5110 80
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L5138 100
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65nm Celeron Processors
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T1700/1600 100
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560/550/540/530 100
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=============== =============================================== ================
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