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[Bug 231107] CPU frequency policy
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Fri, 9 Feb 2007 04:30:23 -0700 (MST)
  • Message-id: <20070209113023.05C6BD40@xxxxxxxxxxxxxxxxxxxxxx>
https://bugzilla.novell.com/show_bug.cgi?id=231107





------- Comment #23 from seife@xxxxxxxxxx 2007-02-09 04:30 MST -------
(In reply to comment #22)

> Can you try to reproduce the bug by setting up cpufreq by hand:
> Set:
> CPUFREQ_ENABLED="no"
> in
> /etc/sysconfig/powersave/cpufreq

This does nothing in 10.2, the modules are loaded by the hal init script.

> If you reboot (without AC to try whether the problem got workarounded), check
> that powernow-k8 module and cpufreq_ondemand modules were not loaded.
> Then load them:
> modprobe powernow-k8
> modprobe cpufreq_ondemand
> and activate the ondemand governor:
> echo ondemand >/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
>
> Try the watch/monitor commands from above and play with AC (un)plug.
> Does it work now?
> If it works now, can you revert the sysconfig variable to:
> CPUFREQ_ENABLED=""
> again and
> change in /etc/sysconfig/powersave/scheme_powersave
> CONSIDER_NICE="yes"
> (I am not sure whether it's still this variable that is used for setting
> ignore_nice in 10.2, Seife or Holger may want to correct me here).
> Reboot and play again with AC (un)plug.
> If it now again works we probably have a nasty locking problem when writing to
> ignore_nice when using ondemand governor.
>
> If setting up cpufreq manually does not work, I exect a BIOS problem, as I got
> confirms that switching up after unplugging AC works generally (but this was
> not a SUSE system and he used powernowd. We need to check whether setting the
> ignore_nice by powersaved is the problem).

Powersaved does nothing with cpufreq at all. It is all handled by HAL and the
desktop applets. But there was a bug in HAL wrt. ignore_nice which has been
fixed with an online update IIRC.

So installing the HAL online update and testing again would be my first
suggestion.


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