kwin 100% - KDE session nearly frozen.

[augustin]

I just upgraded a kubuntu box to 12.04. The upgrade itself was flawless. However, upon reboot, KDE is d*mn slow, nearly frozen. I SSH onto that box from another box to find out thak kwin is at 100% CPU.

I have read about disabling desktop effects.... but I cannot do it from within this unusable KDE session. I must do it from the command line, via SSH. What configuration file must I change manually?

[SteveRiley]

Quick thought... can you press [Alt]+[Shift]+[F12] to disable effects, and thus regain some control? Or is KWin consuming so much CPU that it won't even respond to this one keystroke combination?

If that doesn't work, here are a couple command-line methods for disablng compositing:

qdbus org.kde.kwin /KWin toggleCompositing

kwriteconfig --file kwinrc --group Compositing --key Enabled false
nohup kwin --replace

[augustin]

Thank you very much, Steve.

I finally used this last method via SSH, before starting the KDE session:

kwriteconfig --file kwinrc --group Compositing --key Enabled false

Also, since I had other users to take care of, now that I knew what to do, I manually edited the config files for each user:

sudo vi /home/user/.kde/share/config/kwinrc

I'll document this and post a follow up later.

Thanks again!

[augustin]

Also, from what I read in other threads, that may be due to a nvidia driver problem? Can we expect a fix soon?

[aybesea]

Try the fix I posted here. It worked for me.

[Cresho]

Try the fix I posted here. It worked for me.

Tried this fix, it didnt work for me, no driver works for me. its fine at first but it either crashes during game or it crashes during desktop. must be a kwin issue not nvidia. I did a fresh install with this fix. so far, im gona give it a second chance before I decide to use jump towards xubuntu.

[Cresho]

well, second try. No crashes yet. It looks like the other crash was just a fluke.

[schnelle]

If you still have problems, you can reset kwin settings to its defaults by removing ~/.kde/share/config/kwinrc file and then alt+f2 and type kwin --replace.