One was my main system running 12.1 that was using KDE 4.7, the other my sandbox system that is running 12.2 and KDE 4.8
Since the upgrade both systems are very sluggish and slow to respond to anything, scrolling a web page, switching between windows, exiting screensaver, just generally everything is very slow.
At first I thought it was Nepomuk indexing, but that finished long ago, and I cant see what is causing it to be so slow.
The only process that seems to be using any cpu time of significance is kwin.
Any ideas on how I can pinpoint this or is it possible to change back to 4.8 or 4.7 and see if it goes back to normal?
Interestingly, I turned off Desktop Effects on both systems, and speed has gone back to normal, also kwin is not using any cpu time anymore, previously it was using anything from 5 - 50 %. I can live without desktop effects in the meantime, but there must be some issue with this running KDE 4.9.2 as this has never been an issue before I changed to 4.9.2.
Never say “never” I experienced similar issues under all KDE4 versions I tried. I do not know what exactly triggers them but it is not something new in any case.
Check in the advanced settings for the desktop effects to what they are
set (xrender vs opengl for effects and raster vs native for qt), I have
seen after my upgrade to 4.9 that it switched to xrender instead of
opengl which means everything is done in the CPU instead of the GPU, if
your graphics card is good enough use opengl of course.
–
PC: oS 12.2 x86_64 | i7-2600@3.40GHz | 16GB | KDE 4.8.5 | GeForce GT 420
ThinkPad E320: oS 12.2 x86_64 | i3@2.30GHz | 8GB | KDE 4.9.2 | HD 3000
eCAFE 800: oS 12.2 i586 | AMD Geode LX 800@500MHz | 512MB | KDE 3.5.10
Thanks for that tip Martin. My system has a half-decent nvidia card and the nvidia driver installed but still had the desktop effects setting as xrender.
Am 07.10.2012 22:26, schrieb dth2:
>
> Thanks for that tip Martin. My system has a half-decent nvidia card and
> the nvidia driver installed but still had the desktop effects setting as
> xrender.
>
>
A “half decent” nvidia card is more than enough to set it back to opengl
and native. Have you tried it? It should resolve the problem (if your
nvidia driver is active).
To be sure that the nvidia driver is in use you can use
glxinfo | grep -i opengl
this should show in one line the driver version and and NVIDIA as
vendor, if you see that it is working.
–
PC: oS 12.2 x86_64 | i7-2600@3.40GHz | 16GB | KDE 4.8.5 | GeForce GT 420
ThinkPad E320: oS 12.2 x86_64 | i3@2.30GHz | 8GB | KDE 4.9.2 | HD 3000
eCAFE 800: oS 12.2 i586 | AMD Geode LX 800@500MHz | 512MB | KDE 3.5.10
I experienced similar issues under all KDE4 versions I tried. I do not know what exactly triggers them but it is not something new in any case.