okay ...
Ben, that small patch in attachment #163891 does indeed fix the screen flickering for me: I built three versions of radeon.ko against 3.16.7-ckt2 from debian/testing: 1) vanilla version: reproducible flickering, it's even easier to reproduce by quickly dragging a medium sized window around in circles 2) superseded version (attachment #159331): no flickering, might contain a typo on line 1002, but I did not fix that one and it ran flawless for days 3) current version (#attachment 163891): no flickering, C.K. might need somebody to confirm this patch is working fine as well Since I ingeniously managed to forget my pw AND the security question, I can't sign into my bugzilla.kernel.org account and tell him this myself O_o If you could look at that patch and then decide whether it's safe to use for debian 3.16 that would be much appreciated.