Public bug reported:
Description: Ubuntu 8.04
Release: 8.04
Clean (no previous configuration or data), full install, 64bit
ThinkPad X61 7675-CTO
BIOS Version: 2.07 (latest as of May 30, 2008)
What I expect to happen:
- The CPU fan should run between 0 and 6000 RPM based on processor temperature,
as experienced with previous versions of Ubuntu, and with Windows XP.
What Happens instead:
- When the system's temperature is above spec, the fan spins no faster than
~3200 RPM.
- When the system's temperature is normal or cooler, the fan spins at ~3200
RPM, and very rarely operates at a slower speed.
The fan's maximum speed is 6000 RPM. Sourced from Lenovo's HMM
Documentation & verified with lmsensors output as described:
modprobe ibm_acpi experimental=1
echo 0x2F 0x40 > /proc/acpi/ibm/ecdump
This disengages the PWM control. Via lmsensors, one can see that the fan
ramps up to about 6000 RPM and stays there. At this fan speed, I can put
a heavy load (`yes | sha512sum` is my test) on the system and see that
the CPU temperature stabilizes below spec - the heat sink works.
I suspect thinkpad_acpi, but cannot prove it.
ProblemType: Bug
Architecture: amd64
Date: Wed Apr 30 11:19:07 2008
DistroRelease: Ubuntu 8.04
Package: linux-ubuntu-modules-2.6.24-16-generic 2.6.24-16.23
PackageArchitecture: amd64
ProcEnviron:
PATH=/home/username/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-ubuntu-modules-2.6.24
Uname: Linux 2.6.24-16-generic x86_64
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug
--
Hardy does not control the CPU fan properly.
https://bugs.launchpad.net/bugs/224876
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