Option "DmaType" "PCI" also helps, I could run glxgears and many GL screensavers. But I sometimes had small garbage squares in the top left corner, maybe like those mentioned in the upstream bug, and eventually it crashed (full freeze).
Option "DmaType" "PCI" also helps, I could run glxgears and many GL screensavers. But I sometimes had small garbage squares in the top left corner, maybe like those mentioned in the upstream bug, and eventually it crashed (full freeze).