[Bug 373633] Re: Virtual desktop size setting disables HW acceleration

[Geir Ove Myhr]

Unfortunately, your chipset (945GM) has a hardware limitation in that it
does not support hardware acceleration if the virtual desktop (as
defined in xorg.conf) exceeds 2048 in one direction. This usually
happens when you use an extended desktop side-by-side. A possible
workaround is to place the monitors above one another. This bug is a
duplicate of bug 146859.

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Virtual desktop size setting disables HW acceleration
https://bugs.launchpad.net/bugs/373633
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