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#1 2016-10-20 22:45:47

alex.forencich
Member
Registered: 2011-05-29
Posts: 96

Coretemp stops reporting new temperatures

I have a Supermicro motherboard with an Intel Atom C2758 processor where coretemp does not seem to be working correctly.  The core temperature sensor appears to be detected correctly with sensors-detect and shows up as expected in the output of running 'sensors' as coretemp-isa-0000.  However, the temperatures reported only update for a short period of time after the system boots.  After that, the reported temperatures get 'stuck' and do not change.  I can get the overall CPU temperature from the IPMI interface with ipmitool, and this value does change over time even after the values reported by coretemp stop updating.  I don't see any interesting messages in dmesg.  Has anyone else seen anything like this before? 

cpuinfo:

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 77
model name      : Intel(R) Atom(TM) CPU  C2758  @ 2.40GHz
stepping        : 8
microcode       : 0x127
cpu MHz         : 2400.000
cache size      : 1024 KB
physical id     : 0
siblings        : 8
core id         : 0
cpu cores       : 8
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes rdrand lahf_lm 3dnowprefetch epb tpr_shadow vnmi flexpriority ept vpid tsc_adjust smep erms dtherm arat
bugs            :
bogomips        : 4802.11
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

output of sensors:

coretemp-isa-0000
Adapter: ISA adapter
Core 0:       +47.0°C  (high = +98.0°C, crit = +98.0°C)
Core 1:       +47.0°C  (high = +98.0°C, crit = +98.0°C)
Core 2:       +47.0°C  (high = +98.0°C, crit = +98.0°C)
Core 3:       +47.0°C  (high = +98.0°C, crit = +98.0°C)
Core 4:       +46.0°C  (high = +98.0°C, crit = +98.0°C)
Core 5:       +46.0°C  (high = +98.0°C, crit = +98.0°C)
Core 6:       +47.0°C  (high = +98.0°C, crit = +98.0°C)
Core 7:       +46.0°C  (high = +98.0°C, crit = +98.0°C)

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#2 2016-10-20 23:00:59

alex.forencich
Member
Registered: 2011-05-29
Posts: 96

Re: Coretemp stops reporting new temperatures

The entries in /sys/devices/platform/coretemp.0 are also not changing.  So the problem is definitely either a hardware issue or a driver issue, not an issue with lm-sensors. 

$ cat /sys/devices/platform/coretemp.0/hwmon/hwmon0/temp*_input
47000
47000
47000
47000
46000
46000
47000
46000

Edit: reloading the coretemp module also does not help.  The values reported by sensors and sysfs are the same before and after reloading the driver.

Last edited by alex.forencich (2016-10-20 23:18:35)

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#3 2016-10-22 17:03:34

mich41
Member
Registered: 2012-06-22
Posts: 796

Re: Coretemp stops reporting new temperatures

I think you can take this straight to bugzilla.kernel.org.

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#4 2016-10-22 17:28:45

alex.forencich
Member
Registered: 2011-05-29
Posts: 96

Re: Coretemp stops reporting new temperatures

Done.  Kernel bug report is here, just in case this affects anyone else: https://bugzilla.kernel.org/show_bug.cgi?id=179981

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