https://bugzilla.kernel.org/show_bug.cgi?id=15946
Zdenek Behan <r...@matfyz.cz> changed:
What |Removed |Added
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CC| |r...@matfyz.cz
--- Comment #40 from Zdenek Behan <r...@matfyz.cz> 2011-01-06 01:32:02 ---
Same message happens on my Asus U6V, in my dmesg right after forced halt is:
Jan 5 19:16:49 falcon kernel: [89597.368754] Critical temperature reached (127
C), shutting down.
Jan 5 19:16:49 falcon logger: ACPI event unhandled: thermal_zone THRM 000000f0
00000001
However, this is only half-bogus. This has happened lately several times, every
time under heavy load, and I managed to decrease the incidence of the problem
almost entirely by vacuuming the heatsink, which has probably gotten to the
point of being too dusty and not cooling enough over time.
I have been watching the output of "sensors" and "grep .
/sys/class/thermal/*/*" closely just prior to the forced halt. In idle state
(just desktop running), the temperature stays just under 60C according to all
outputs. Putting everything under very heavy load can raise this all the way up
to 82-85C, which is pretty hot, but hardly critical.
According to /sys/class/thermal/thermal_zone0/, both trip points are set to
110C, and it's very unlikely that the CPU would suddenly jump over 40 degrees C
to 127.
Maybe the output of the EC is simply wrongly understood? Maybe there's a
flipping bit that is not used for actual temperature output, but is incorrectly
interpreted that way. Maybe the other people who have this problem too are
simply running too hot normally, so this "fake trip point" happens to them
without any load. Only thing that seems to be rather certain that up to the
point of the magical jump to 127C, the temperature is reported correctly,
because it is indicated almost identically by two independent sensors (the
builtin core sensor, acpi-tz).
Just wild guesses, but I thought I'll report my findings. I can probably "fix"
the problem for myself by doing something more serious about heatsink, and
keeping the laptop cool, but this is an annoying bug nonetheless.
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