Public bug reported:
Sometimes, after a resume, the fan runs at full speed until the system
is completely shutdown. Another suspend/resume won't resolve this issue.
Analysis
/proc/acpi/fan/FAN(0|1|2|3)/state give the state of the fan. After a resume,
the bios activates the fan at full speed. And these variables should be updated.
Most of the time, at least, one of these variables is set to "on" and Linux
lower the fan speed after the resume.
However sometimes all these variables are set to off (whereas the fan is
running at full speed). In this case, the fan will remain at full speed.
Workaround
The workaround is to launch a program consuming a lot of CPU power, like
burnK7. When the temperature reaches the first trip point
(/proc/acpi/thermal_zone/CPUZ/trip_points), Linux activates the fan, and the
fan speed is then reduced.
uname-a
Linux non-carus 2.6.27-11-generic #1 SMP Thu Jan 29 19:24:39 UTC 2009 i686
GNU/Linux
ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 8.10
NonfreeKernelModules: fglrx
Package: linux-image-2.6.27-11-generic 2.6.27-11.27
ProcCmdLine: User Name=UUID=d0140d59-c4e4-46fa-82d9-078ce590db6e ro quiet splash
ProcEnviron:
LANGUAGE=en_US:en
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.27-11.27-generic
SourcePackage: linux
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug
--
Noisy fan after resume on HP 6735s (reproducibility about 20%)
https://bugs.launchpad.net/bugs/343128
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