http://bugzilla.kernel.org/show_bug.cgi?id=12620
------- Comment #29 from mle+report...@mega-nerd.com 2009-02-16 15:44 -------
ykzhao,
You should be aware that regardless of the value of
/proc/acpi/fan/FAN/state, the fans (CPU and system fan) are on, all
the time, regardless of temperature. Their speed also does not vary
with temperature.
Anyway, here's what I did:
a) Booted from a cold start (machine switched off overnight).
b) Set "thermal.act=-1" in grub's menu.lst
c) Rebooted.
d) On boot, checked /etc/cmdline for new thermal.act setting (ok).
e) Messed with /proc/acpi/fan/FAN/state (added it to /etc/rc.local)
prompt# echo 0 > /proc/acpi/fan/FAN/state
prompt# cat /proc/acpi/fan/FAN/state
status: on
f) Let the machine heat up.
g) Rebooted.
On reboot, the behaviour was the same as before, kacpi_notify running
at 50-60% CPU.
Also checked that everything was as expected (thermal.act in /proc/cmdline,
/proc/acpi/fan/FAN/state and THERMAL settings in /proc/config.gz). Everything
was as expected.
At this point I am willing to accept that the BIOS on this board is buggy
and that there is nothing that can be done in the kernel to work around
the broken-ness.
Thanks very much for you exemplary level of support on this issue. It was
much, much better than I get from any commercial company I've dealt with
in the last 5 years.
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