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gawlOffline
Post subject: Temperate/Fan Problem with new Kernels on Old(er) Laptop  PostPosted: 25.08.2015, 19:09



Joined: 2011-01-26
Posts: 10

Status: Offline
I use an HP laptop "Compaq 6710b" (with the original hard drive being replaced by an SSD).
Kernel vmlinuz-3.17-2.slh.7-aptosid-amd64 was the last kernel version that has been running perfectly until today.
With all later kernel versions I have had the problem that the fan is permanently running. Although this is better than a non-working fan, the fan is loud and annoying, especially since I want to use this laptop mainly for listening to music.

The "sensors" command from the lm-sensors package shows an interesting difference:

With kernel 3.17.2:
      Code:
acpitz-virtual-0
Adapter: Virtual device
temp1:        +50.0°C  (crit = +256.0°C)
temp2:        +48.0°C  (crit = +108.0°C)
temp3:        +42.0°C  (crit = +105.0°C)
temp4:        +25.5°C  (crit = +108.0°C)
temp5:        +20.0°C  (crit = +110.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Core 0:       +50.0°C  (high = +100.0°C, crit = +100.0°C)
Core 1:       +50.0°C  (high = +100.0°C, crit = +100.0°C)


With kernel vmlinuz-4.1.0-2.slh.2-aptosid-amd64:
      Code:
acpitz-virtual-0
Adapter: Virtual device
temp1:        +51.0°C  (crit = +256.0°C)
temp2:        +46.0°C  (crit = +108.0°C)
temp3:        +41.0°C  (crit = +105.0°C)
temp4:        +26.0°C  (crit = +108.0°C)
temp5:       +100.0°C  (crit = +110.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Core 0:       +47.0°C  (high = +100.0°C, crit = +100.0°C)
Core 1:       +49.0°C  (high = +100.0°C, crit = +100.0°C)


So, obviously "temp5" is close to its limit, so that this is maybe an explanation for the fan running... However, I have no idea what "temp5" is and why it depends on the kernel version (and what to do to prevent it from going up)...
(Both "sensors" commands entered directly after boot-up into the usual framebuffer terminals, i.e. no X11 graphic running.)
By the way, all process checks (ps, top) show no difference between the kernel versions, so that I'd assume the problem is rather with the kernel (or some temperature measurement problem with the "coretemp" module?)
Any ideas?
Thanks for your time and your suggestions! Smile
 
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slhOffline
Post subject: RE: Temperate/Fan Problem with new Kernels on Old(er) Laptop  PostPosted: 25.08.2015, 23:35



Joined: 2010-08-25
Posts: 949

Status: Offline
Keep an eye on temp5 under both kernels, low- and high load use cases. An even 100°C looks a bit bogus, as does an even 20°C - so my guess would be that temp5 doesn't change relative to the system load (while the others do), but this needs checking.

Bogus temperature readings aren't that uncommon, and they could have consequences like this, but getting those fixed (without git bisecting the kernel, which is probably the only option for debugging) will be very hard, as these issues are extremely hardware dependent (exact same mainboard, exact same BIOS revision (make sure that yours if up to date), etc.).
 
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