CPU scheduling causes temporary freeze when unplugged from AC

[Joss Winn]

When unplugging AC power from my Dell D430 laptop, I get a temporary freeze due to the CPUs spiking. This only occurs when logged into Gnome. It does not occur when only GDM is running. Immediately after logging into Gnome, with only the panel and applets running, this problem is apparent.

Syslog shows this at the time of unplugging:

Jul 15 21:16:12 joss-laptop kernel: [ 500.128223] CPU0 attaching NULL sched-domain.
Jul 15 21:16:12 joss-laptop kernel: [ 500.128231] CPU1 attaching NULL sched-domain.
Jul 15 21:16:12 joss-laptop kernel: [ 500.151256] CPU0 attaching sched-domain:
Jul 15 21:16:12 joss-laptop kernel: [ 500.151263] domain 0: span 03
Jul 15 21:16:12 joss-laptop kernel: [ 500.151266] groups: 01 02
Jul 15 21:16:12 joss-laptop kernel: [ 500.151270] CPU1 attaching sched-domain:
Jul 15 21:16:12 joss-laptop kernel: [ 500.151272] domain 0: span 03
Jul 15 21:16:12 joss-laptop kernel: [ 500.151275] groups: 02 01

My kernel:

joss@joss-laptop:~$ uname -a
Linux joss-laptop 2.6.24-19-generic #1 SMP Wed Jun 18 14:43:41 UTC 2008 i686 GNU/Linux
joss@joss-laptop:~$

Stopping acpid does not resolve it.

Thank you for your help.
Joss

[Joss Winn (josswinn)]

This is caused by gnome-power-manager. When gnome-power-manager is killed, this bug no longer occurs.

[Brian Murray (brian-murray)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This bug did not have a package associated with it, which is important for ensuring that it gets looked at by the proper developers. You can learn more about finding the right package at https://wiki.ubuntu.com/Bugs/FindRightPackage. I have classified this bug as a bug in gnome-power-manager.

For future reference you might be interested to know that a lot of applications have bug reporting functionality built in to them. This can be accessed via the Report a Problem option in the Help menu for the application with which you are having an issue. You can learn more about this feature at https://wiki.ubuntu.com/ReportingBugs.

[Pedro Villavicencio (pedro)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. Could you please attach the resulting log file of: gnome-power-bugreport.sh &> gpm.log to the report? You might also want to take a look to the Debugging instructions located at https://wiki.ubuntu.com/DebuggingGNOMEPowerManager for submit any other logs related to your problem.Thanks in advance.

[Joss Winn (josswinn)]

I've 'fixed' this by changing the 'policy_battery' from 'ondemand' to 'powersave'. If you're still interested in debugging this further, please let me know. File requested is attached.

Thank you,
Joss

[Dimitrios Symeonidis (azimout)]

Hi Joss, is this still an issue for you with the latest Ubuntu version?
Thank you

[Victor Vargas (kamus)]

We are closing this bug report because it lacks the information we need to investigate the problem. Please reopen it if you encounter that this issue is still occurring or even better if you can check in latest Ubuntu Karmic version. To reopen the bug report you can click under the Status column, and change the Status back to "New". Thanks again!