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1Kernel driver coretemp
2======================
3
4Supported 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
16Author: Rudolf Marek
17
18Description
19-----------
20This driver permits reading the DTS (Digital Temperature Sensor) embedded
21inside Intel CPUs. This driver can read both the per-core and per-package
22temperature using the appropriate sensors. The per-package sensor is new;
23as of now, it is present only in the SandyBridge platform. The driver will
24show the temperature of all cores inside a package under a single device
25directory inside hwmon.
26
27Temperature is measured in degrees Celsius and measurement resolution is
281 degree C. Valid temperatures are from 0 to TjMax degrees C, because
29the actual value of temperature register is in fact a delta from TjMax.
30
31Temperature known as TjMax is the maximum junction temperature of processor,
32which depends on the CPU model. See table below. At this temperature, protection
33mechanism will perform actions to forcibly cool down the processor. Alarm
34may be raised, if the temperature grows enough (more than TjMax) to trigger
35the Out-Of-Spec bit. Following table summarizes the exported sysfs files:
36
37All Sysfs entries are named with their core_id (represented here by 'X').
38tempX_input - Core temperature (in millidegrees Celsius).
39tempX_max - All cooling devices should be turned on (on Core2).
40tempX_crit - Maximum junction temperature (in millidegrees Celsius).
41tempX_crit_alarm - Set when Out-of-spec bit is set, never clears.
42 Correct CPU operation is no longer guaranteed.
43tempX_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
47On CPU models which support it, TjMax is read from a model-specific register.
48On other models, it is set to an arbitrary value based on weak heuristics.
49If these heuristics don't work for you, you can pass the correct TjMax value
50as a module parameter (tjmax).
51
52Appendix A. Known TjMax lists (TBD):
53Some information comes from ark.intel.com
54
55Process Processor TjMax(C)
56
5722nm 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
6832nm 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
7432nm Core i7 Extreme Processors
75 980X 100
76
7732nm Celeron Processors
78 U3400 105
79 P4505/P4500 90
80
8132nm Atom Processors
82 Z2460 90
83 D2700/2550/2500 100
84 N2850/2800/2650/2600 100
85
8645nm 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
9245nm 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
9945nm 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 CE4170/4150/4110 110
109
11045nm Core2 Processors
111 Solo ULV SU3500/3300 100
112 T9900/9800/9600/9550/9500/9400/9300/8300/8100 105
113 T6670/6500/6400 105
114 T6600 90
115 SU9600/9400/9300 105
116 SP9600/9400 105
117 SL9600/9400/9380/9300 105
118 P9700/9600/9500/8800/8700/8600/8400/7570 105
119 P7550/7450 90
120
12145nm Core2 Quad Processors
122 Q9100/9000 100
123
12445nm Core2 Extreme Processors
125 X9100/9000 105
126 QX9300 100
127
12845nm Core i3/i5/i7 Processors
129 i7 940XM/920 100
130 i7 840QM/820/740/720 100
131
13245nm Celeron Processors
133 SU2300 100
134 900 105
135
13665nm Core2 Duo Processors
137 Solo U2200, U2100 100
138 U7700/7600/7500 100
139 T7800/7700/7600/7500/7400/7300/7250/7200/7100 100
140 T5870/5670/5600/5550/5500/5470/5450/5300/5270 100
141 T5250 100
142 T5800/5750/5200 85
143 L7700/7500/7400/7300/7200 100
144
14565nm Core2 Extreme Processors
146 X7900/7800 100
147
14865nm Core Duo Processors
149 U2500/2400 100
150 T2700/2600/2450/2400/2350/2300E/2300/2250/2050 100
151 L2500/2400/2300 100
152
15365nm Core Solo Processors
154 U1500/1400/1300 100
155 T1400/1350/1300/1250 100
156
15765nm Xeon Processors 5000 Quad-Core
158 X5000 90-95
159 E5000 80
160 L5000 70
161 L5318 95
162
16365nm Xeon Processors 5000 Dual-Core
164 5080, 5063, 5060, 5050, 5030 80-90
165 5160, 5150, 5148, 5140, 5130, 5120, 5110 80
166 L5138 100
167
16865nm Celeron Processors
169 T1700/1600 100
170 560/550/540/530 100