On 8 November 2010 21:07, Chris Rouch <chris.rouch(a)gmail.com> wrote:
On 8 November 2010 17:13, Rex Dieter <rdieter(a)math.unl.edu>
wrote:
> On 11/08/2010 03:02 AM, Chris Rouch wrote:
>> Over the weekend yum pulled in the newest version of kde for f13
>> (4.5.2 I think). Since I rebooted and logged in my laptop seems to
>> have the fan going most of the time. Gkrellm shows both CPUs are doing
>> something, and top confirms that kwin and plasma desktop are each
>> using between 10% and 30% CPU. For comparison on my f12 desktop at
>> work they use between 2 and 5% cpu. I don't know what the used before
>> the upgrade, but I do know the fan was usually off except when the
>> machine was loaded.
>>
>> This happens with only one window (firefox), and that only having a
>> couple of tabs open.
>>
>> Is this something I can change? If so, where do I need to look?
>
> Depends on a lot of things.
>
> What video driver is in use?
Latest nvidia, from rpmfusion
>
> What arch?
x86_64
>
> Is flash installed, and any applets running in any of those flash tabs
> you mention?
Yes it is installed, but none of the tabs are visibly using it (I
had/have gmail and a bbc news page open - the latter is static).
>
> Are destkop effects enabled? Which effects? (blur in particular, is
> known to cause degraded performance/load with many driver combinations).
Desktop effects are enabled. I had blur enabled and I've just disabled
it. No immediate effect - the fan is still spinning, though the cpu
percentages are now down to 10-15%.
Switching off all desktop effects makes a big difference. kwin is no
longer in top's list of cpu hogs, and plasma desktop sits around 1%
until I actually do something, when it goes to around 15%.
I think it was shadow that was actually doing the damage on my laptop.
I started disabling the effects I didn't care about until the cpu
dropped.
Chris