kernel bug jaunty fan control
gist of below post: fan control problem with jaunty kernel on Thinkpads.
Note: My laptop never shuts down on me but the heat generated is
definitely a regression from olders ubuntu. Well I thought so until I
tested a lot of them.
Generated thinkpad lshw for my thinkpad T61 (file thinkpad-t61-lshw).
Running i386 arch.
Attached dmidecode (file thinkpad-t61-dmidecode) and acpidump (file
thinkpad-t61-acpidump).
on kernel 2.6.28-13-generic
-----------------------------------
grabbed sensors for normal workload (email, firefox, music, a term or two)
check file sensors $KERNEL normal usage
~ 78C
stressed system (with stress --cpu 16 --vm 2 --vm-bytes 128M)
after 10 minutes: ~ 90C (see sensors $KERNEL stress file)
temperature is too hot to have laptop on lap. It is CLEAR that the fans
are not spinning at their max speed.
Since I had already enabled the manual fan control workaround mentionned
in this post ("options thinkpad_acpi fan_control=1" in
/etc/modprobe.d/options) I decided to disengage them to see if
temperature would lower. It did.
oliv...@boreale:~$ sudo -s
r...@boreale:~# echo "level disengaged" > /proc/acpi/ibm/fan
Doing so, the fan speed gradually raise from 3000 to around 5000 in a few
seconds (see proc-acpi-ibm-fan linux-2.6.28-13 file).
5 minutes later still under stress, the temp was back at 78C (see sensors
$KERNEL stress with manual fan control) and dropped even to 74C later
on kernel 2.6.27-14-generic
-----------------------------------
oliv...@boreale:~$ uname -a
Linux boreale 2.6.27-14-generic #1 SMP Fri Jun 5 10:14:59 UTC 2009 i686
GNU/Linux
normal workload: ~76C (see sensors $KERNEL normal usage)
stressed system (with stress --cpu 16 --vm 2 --vm-bytes 128M)
after 10 minutes: ~ 89C (see sensors $KERNEL stress file)
oliv...@boreale:~$ sudo -s
r...@boreale:~# echo "level disengaged" > /proc/acpi/ibm/fan
Doing so, the fan speed gradually raise from 3300 to around 5000 in a
few seconds
5 minutes later still under stress, the temp was at 78C (see sensors
$KERNEL stress with manual fan control)
on mainline kernel 2.6.28-x
-----------------------------------
oliv...@boreale:~$ uname -a
Linux boreale 2.6.28-02062810-generic #02062810 SMP Tue May 5 19:28:54 UTC 2009
i686 GNU/Linux
normal workload: ~73C (see sensors $KERNEL normal usage)
stressed system (with stress --cpu 16 --vm 2 --vm-bytes 128M)
after 10 minutes: ~ 90C (see sensors $KERNEL stress file)
oliv...@boreale:~$ sudo -s
r...@boreale:~# echo "level disengaged" > /proc/acpi/ibm/fan
Doing so, the fan speed gradually raise from 3300 to around 5100 in a
few seconds
5 minutes later still under stress, the temp was at 77C (see sensors
$KERNEL stress with manual fan control)
Warning: below tests performed on a cooler day
on mainline kernel 2.6.30-x
-----------------------------------
oliv...@boreale:~$ uname -a
Linux boreale 2.6.30-020630-generic #020630 SMP Wed Jun 10 09:45:40 UTC 2009
i686 GNU/Linux
normal workload: ~62C (see sensors $KERNEL normal usage)
stressed system (with stress --cpu 16 --vm 2 --vm-bytes 128M)
after 10 minutes: ~ 86C (see sensors $KERNEL stress file)
oliv...@boreale:~$ sudo -s
r...@boreale:~# echo "level disengaged" > /proc/acpi/ibm/fan
Doing so, the fan speed gradually raise from 3300 to around 5100 in a
few seconds
5 minutes later still under stress, the temp was at 76C (see sensors
$KERNEL stress with manual fan control)
on mainline kernel 2.6.27-x
---------------------------
oliv...@boreale:~$ uname -a
Linux boreale 2.6.27-020627-generic #020627 SMP Sat Jan 31 17:24:52 UTC 2009
i686 GNU/Linux
normal workload: ~78C (see sensors $KERNEL normal usage)
stressed system (with stress --cpu 16 --vm 2 --vm-bytes 128M)
after 10 minutes: ~ 89C (see sensors $KERNEL stress file)
oliv...@boreale:~$ sudo -s
r...@boreale:~# echo "level disengaged" > /proc/acpi/ibm/fan
Doing so, the fan speed gradually raise from 3300 to around 5100 in a
few seconds
5 minutes later still under stress, the temp was at 76C (see sensors
$KERNEL stress with manual fan control)
8.10 LiveCD
on kernel 2.6.27-7-generic
--------------------------
# uname -a
Linux ubuntu 2.6.27-7-generic #1 SMP Fri Oct 24 06:42:44 UTC 2008 i686 GNU/Linux
normal workload: ~50C (see sensors $KERNEL normal usage)
stressed system (with stress --cpu 16 --vm 2 --vm-bytes 128M)
after 10 minutes: ~ 91C (see sensors $KERNEL stress file)
Fan still only at 3000 rpms. I haven't tried with the fan disengaged
because I haven't added the module param.
8.04.2 LiveCD
on kernel 2.6.27-7-generic
--------------------------
ubu...@ubuntu:~$ uname -a
Linux ubuntu 2.6.24-23-generic #1 SMP Thu Nov 27 18:44:42 UTC 2008 i686
GNU/Linux
The output of sensors is different in this case. I took the highest
temp.
normal workload: ~51C (see sensors $KERNEL normal usage)
stressed system (with stress --cpu 16 --vm 2 --vm-bytes 128M)
after 10 minutes: ~ 87C (see sensors $KERNEL stress file)
Fan still only at 3000 rpms. I haven't tried with the fan disengaged
because I haven't added the module param.
Conclusion:
I am very confused. Results are mostly the same with a lot of different kernels
and I was _sure_ that my fan kicked in on heavy workloads when using earlier
ubuntu releases.
Where to go from here? Should I:
- Try to mess with my BIOS settings?
- Try another distro livecd and check temp?
- Mess with thinkpad_acpi params?
I am willing to run any other thing you need for further investigation.
** Attachment added: "thinkpad-t61-lshw"
http://launchpadlibrarian.net/28916243/thinkpad-t61-lshw
--
Ubuntu 9.04 laptop overheat and shutdown
https://bugs.launchpad.net/bugs/370173
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