Created attachment 128169 [details]
Xorg log file

Regression with commit 1106b2f773ad0611c729b27f4c192a26b43ef1e7 on Radeon R9
270x (PITCAIRN). After this commit I get the following messages in Xorg.log
(none of these has been seen before):

(WW) RADEON(0): flip queue failed in radeon_scanout_flip: No such file or
directory

Seems like refresh is broken as switching to VT and back shows updated content.
Let me know if you need more details.