Public bug reported:
When using cool 'n' quiet the system unexpectedly locks up. I've read
several posts including 109643, about similiar problems, but I think
it's a kernel or powernow-k8 bug.
I can reproduce the lock up or freeze the following way:
1. boot up with no powernow-module (set DO_MODULES=no in
/etc/init.d/powernowd.early)
2. go to runlevel 1 to ensure no graphics or gnome-applets interfere
3. load powernow-k8: sudo modprobe powernow-k8
4. now I can check the cpu frequency with cat
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
5. start powernowd to get the ondemand governor enabled: /etc/init.d/powernowd
start
6. check the cpu freq, it should be switched down
7. now bring some load onto the cpu, I use the burnK7 command from the cpuburn
package
8. when I start and stop this command several times to force cool 'n' quiet to
switch the frequency up and down I get the lockup and a kind of stack trace on
the console.
I couldn't think of another way to conserve this as to take a picture, but I
don't now how to attach it here.
My system is a Athlon 64 X2 on a ASUS M2N-E Mainboard with nVidia nForce 570
Ultra Chipset. BIOS is flashed to the latest version (v801).
I'm using Feisty right now, but I believe I experienced such lock up also with
Edgy.
Kernel is 2.6.20-15-generic.
It would be nice if somebody could confirm this is a linux bug and maybe
bring it to kernel developers attention...
** Affects: Ubuntu
Importance: Undecided
Status: Unconfirmed
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cool 'n' quiet crashes kernel
https://bugs.launchpad.net/bugs/114643
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