https://bugs.freedesktop.org/show_bug.cgi?id=49943
--- Comment #9 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #8)
Reproducible with linux-3.6.0-rc6. If it is a duplicate of bug 51042, shouldn't this be fixed now, or have the patches referenced in that bug not been committed yet (http://comments.gmane.org/gmane.comp.freedesktop.xorg.drivers.ati/22107, or more specific the patches by Daniel Vetter: http://lists.freedesktop.org/archives/dri-devel/2012-May/023407.html)?
If you disable polling, it also disables hotplug propagation since they share the same infrastructure in the common drm code. Daniel's patches have not been merged upstream yet.