https://bugs.freedesktop.org/show_bug.cgi?id=32350
--- Comment #29 from Alex Deucher agd5f@yahoo.com 2011-02-01 18:26:30 PST --- (In reply to comment #27)
Did the following test to see if it was a DRI or driver problem. startup runlevel 1. No X. pm-suspend
resume. Screen goes crazy.
Does the screen have issues when you unplug the power adapter if the radeon driver is not loaded at all (blacklist the radeon drm and don't start X)? Sounds to me like a platform issue (maybe ACPI?) rather than a driver issue.