http://bugzilla.kernel.org/show_bug.cgi?id=13497
Summary: CPU fan at full speed after resume
Product: ACPI
Version: 2.5
Kernel Version: 2.6.29.4-167.fc11.x86_64
Platform: All
OS/Version: Linux
Tree: Fedora
Status: NEW
Severity: normal
Priority: P1
Component: Power-Sleep-Wake
AssignedTo: acpi_power-sleep-w...@kernel-bugs.osdl.org
ReportedBy: st...@nexusuk.org
Regression: No
On an Acer TravelMate 6413 notebook, if I suspend to RAM and leave it suspended
for over about 3 minutes, when it resumes the CPU fan comes on at full speed
and stays on indefinitely. Hibernating to disk and then resuming returns the
fan to its correct behaviour.
Suspending for very short periods of time doesn't cause this problem, leading
me to believe that there is a timeout involved (wild conjecture: maybe the
kernel needs to keep poking the fan, after it hasn't done so for some time fan
just goes to full speed to protect the hardware?).
I have tried to kick the fan by doing:
echo -n 3 >/proc/acpi/fan/FAN0/state
which produces an error:
-bash: echo: write error: Exec format error
and causes dmesg to log:
ACPI: Transitioning device [FAN0] to D3
Also, doing:
echo -n 0 >/proc/acpi/fan/FAN0/state
produces no error, nor any dmesg log and has no effect on the fan.
Might be unconnected, but gnome's power manager seems to think the battery is
no longer present after suspending (unplugging the power cable and plugging it
back in makes it reappear) - there is nothing obviously wrong in
/proc/acpi/battery/BAT0/ though.
The machine is running the latest BIOS (version 3.04).
This has also been reported in the Fedora Bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=243008
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