If I use Option "BusType" "PCI" I can run mirrorblob after hibernation,
even if I reenable DmaMode to Any (default). I still see some garbage in
the upper left corner when running some screensavers.

To summarize my experiences (in chronological order), default setting in
parenthesis:

Bustype + DmaType + DmaMode -> result
(AGP) + (AGP) + (Any) -> crashes after hibernation with glxgears
(AGP) + (AGP) + None -> crashes after hibernation with mirrorblob
(AGP) + PCI + (Any) -> works a bit, but eventually crashes (with mirrorblob?) 
(garbage in corner)
PCI + (PCI) + None -> good
PCI + (PCI) + (Any) -> good (garbage in corner)

The table is not complete, and I might need to update it over time. All
these reboots take time...

-- 
drm crash, possibly because of savage video-driver
https://launchpad.net/bugs/37218

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