https://bugzilla.kernel.org/show_bug.cgi?id=15946
BW <b.weggenmann+ker...@gmail.com> changed:
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--- Comment #29 from BW <b.weggenmann+ker...@gmail.com> 2010-10-12 00:33:57 ---
(In reply to comment #28)
> The problem persists on 2.6.36-rc3 even on runlevel 3
Hi, I have exactly the same problem since kernel 2.6.31, on basically the same
laptop (Asus V1S with T7500) running gentoo (currently 2.6.35-r4 amd64). I
found in the kernel changelog that there were many changes to thermal stuff in
2.6.30, so maybe it was introduced there. The problem never occured under
Windows Vista and 7 (Which is good, since it implies the hardware is not
broken, and which also is bad, since it implies something not so good about
Linux).
Since I changed from pre-2.6.30 to 2.6.31, I got arbitrary thermal shutdowns.
Within a second, the temperature would jump from the normal 60-80 degrees to
127 degrees, and then the system would shut down. The strange thing is that
this *never* happened e.g. when playing 3D games like Quake Live or nexuiz, but
mostly only when the system was under low to moderate load (e.g. word
processing, playing music, surfing the web etc.).
I recently found some people writing that adding the kernel parameter
acpi_osi="Linux" helps them with fan control on their laptops (the brand was
Toshiba, not Asus). I added the parameter to my kernel boot line, and for the
last two days no thermal shutdown occurred. Unfortunately, this doesn't mean
too much since as explained earlier, the problem occurs sporadically. However,
I also noticed that the fan would generally spin faster. I suspect that without
the acpi_osi parameter, Linux somehow overtakes the fan control or temperature
reading from the BIOS, and while overtaking also "overlooks" that the CPU and
GPU share the same fan. So it might only monitor the CPU temperature, while the
GPU might get really hot since the fan is not spinning fast enough (which
agrees with my observation that the thermal shutdown never occured when playing
games; also note that the V1S has the infamous 8600m that had overheating
issues in some MacBook Pro laptops, although this shouldn't be the problem here
since nothing overheats when booting Windows)
I tried heavy load applications as well as low load. Maybe you could try if
adding that kernel parameter makes a difference on your system. Also, maybe the
Linux devs could look into this further to clarify what's really going on.
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