Extra information. Since today I have added
Option "Shadow" "true"
to the device section in xorg.conf and since that, the artifacts and visual
glitches seem to be gone, and I have yet to see the X server freeze.
Of course this is not a solution, but merely a workaround. I have virtually no
form of acceleration now.
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https://bugs.launchpad.net/bugs/732304
Title:
Intel sandy-bridge dual-head GPU hang
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