Try disabling sync to vblank. Install compizconfig-settings-manager, go
to System->Preferences->Advanced Desktop Effects, go to General Options,
Display Settings tab, and uncheck the option there.
Does that help?
** Changed in: compiz (Ubuntu)
Status: New => Incomplete
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compiz.real (Black screen after idle) crashed with SIGSEGV
https://bugs.launchpad.net/bugs/144785
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