http://bugzilla.kernel.org/show_bug.cgi?id=8850
Summary: CPU fan always on full speed with VIA VN800
Product: ACPI
Version: 2.5
KernelVersion: 2.6.22
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Thermal
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Distribution: Gentoo Linux
Hardware Environment: RoverBook Partner W500L (re-branded FIC LM7VW) with VIA
C7 1.5GHz CPU, VIA VN800 + VT8237R+. The latest available BIOS version from
manufacturer's site is flashed.
Software Environment: Laptop runs Gentoo Linux x86 with latest available
packages.
Problem Description: the CPU fan is always on and its speed is high. VIA C7 CPU
itsels is very low-temperature device and fan should be very slow most of the
time. I can't control fan's speed via /proc/acpi/fan/FAN/state or
/proc/acpi/fan/thermal_zone/THRM/cooling_mode.
rikz # cat /proc/acpi/fan/FAN/state
status: on
rikz # cat /proc/acpi/thermal_zone/THRM/*
0 - Active; 1 - Passive
<polling disabled>
state: ok
temperature: 54 C
critical (S5): 110 C
passive: 78 C: tc1=3 tc2=1 tsp=80 devices=CPU0
active[0]: 60 C: devices= FAN
Even when CPU is 100% busy for a long time, its temperature is lower than 55 C.
When idle it is 43-45 C.
MS Windows slows down the fan when CPU is cool and speeds it up when CPU is
busy.
cat 3 > /proc/acpi/fan/FAN/state does nothing
cat 1 > /proc/acpi/thermal_zone/THRM/cooling_mode does nothing
trip_points are non-writable as I undersrand.
So I just want to lower the speed of the CPU fan, but I see no ways to do it.
The CPU temperature is quiet low and it should be a safe intention.
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