I have the same problem on my kubuntu 12.04 64 bits.
I use composite extension with kwin. I do not use compiz.
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https://bugs.launchpad.net/bugs/994688
Title:
Xorg crash
To manage noti
** Also affects: compiz-core
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1008515
Title:
Compiz crash on resume from suspend w/ NVIDIA 302.11 driver
To