https://bugs.freedesktop.org/show_bug.cgi?id=80531
--- Comment #13 from fredrik@obra.se --- (In reply to comment #12)
Created attachment 102075 [details] [review] add deep color module option
This patch disables the deep color support by default which should resolve your issue. You can set radeon.deep_color=1 on the kernel command line in grub to re-enable it. Hopefully we can resolve this properly for 3.17 and enable deep color by default.
Indeed it does. I've tested with 3.16-rc4 and all is well again. Sorry for the delayed reply. If I can be useful in further testing please let me know. Thanks.