https://bugzilla.kernel.org/show_bug.cgi?id=38472
--- Comment #8 from Alex Deucher alexdeucher@gmail.com 2012-08-24 16:42:47 --- I think this is an issue with the drm fb helper. Since fb doesn't handle multiple heads we only expose the smallest to the fb layer so the "extra" space on the larger heads never gets re-initialized on resume.