[Bug 647467] [NEW] KDE desktop-effects not working

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Using maverick on amd64, fully upgraded, KDE desktop-effects do not work
since some time.

When trying to enable them via kwin config I get this information:

"Desktop effects are not available on this system due to the following
technical issues:"

But no issue is listed.

Log when launching kwin manually:

kwin() KWin::Workspace::setupCompositing: Initializing OpenGL compositing
kwin() KWin::Workspace::setupCompositing: KWin has detected that your OpenGL library is unsafe to use, falling back to XRender. 
kwin(): Failed to initialize compositing, compositing disabled 

For debugging I tried to run glxgears, which work,s but only at 280 fps

Xorg log shows nothing suspicious.

** Affects: kdebase-workspace (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: kde
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KDE desktop-effects not working
https://bugs.launchpad.net/bugs/647467
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