This is, sadly, by design. Because of the long standing GTT-incoherency
bugs (see master bug #541511), we disabled the Intel driver on i855
hardware.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/642257
Title:
Compiz effects not functioning at all in Maverick beta, w/ i855
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