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I have a Nvidia GTS250, and the nvidia-beta nvidia-beta-utils installed.
Until yesterday, everything was OK.
Today, I booted into KDE4, and compositing was disabled. My only update was awesome WM, which I removed.
Every time I try to enable compositing, KDE tells me I can't. Sometimes, a pop notification tells me that there is another application that doesn't allow Kwin compositing. BUT there is none !
I tried Compiz Fusion, it runs OK, so nvidia drivers runs without problem.
What has gone wrong ?
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Problem ... solved (?). I removed everything regarding KDE (pacman -Rcns kdelibs kde kde-meta), reinstalled them, and it's... OK !
I never found out though what went wrong.
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