DRI is only possible if each size is 2048 or lower so direct rendering is not
possible for my resolution (Bug #146859) but it still works in Gutsy without
DRI.
I have found a way to let it in Hardy work.
To make X and rendering with Exa faster I have added these lines
Option "AccelMethod" "EXA"
Option "ExaNoComposite" "false"
Option "MigrationHeuristic" "greedy"
to my xorg.conf. With them X starts fine with my Virtual size of "3046 1050".
Without them my window manager crashes after some seconds after start. At least
I see a mouse and can move it.
** Attachment added: "Xorg.0.log without the workaround (crash)"
http://launchpadlibrarian.net/11986348/Xorg.0.log
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[regression] [Hardy] virtual desktop parameter crashes X (intel)
https://bugs.launchpad.net/bugs/190799
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