https://bugs.freedesktop.org/show_bug.cgi?id=69729
--- Comment #29 from Rafał Miłecki zajec5@gmail.com --- Are you sure you tested 3.11.4? It should work just like 3.12-rc3.
Can you install radeontool and provide output of "avivotools regs hdmi" command when:
1) Playing audio with 3.11.4 (remember about radeon.audio=1) 2) Playing audio with 3.12-rc3