https://bugs.freedesktop.org/show_bug.cgi?id=82473
--- Comment #1 from Alex Deucher agd5f@yahoo.com --- Please attach your dmesg and xorg logs directly to the bug. Is this a regression? If so when was it last working? Can you get a picture of the screen? Does using a non-HDMI (e.g., DVI) connector help? Does booting with radeon.audio=0 on the kernel command line in grub help?