Comment # 3 on bug 997464 from Takashi Iwai

Well, your problem is related with DP, but the apparent issues are different
from the one in bugzilla.kernel.org (e.g. radeon.audio=0 doesn't help
completely).  In general, it's not good to mix up the bug report unless you are
100% sure.  That's why I suggested to open a new bug in
bugzilla.freedesktop.org (which is often better than bugzilla.kernel.org in
case of DRM bugs).

Anyways, you already put the comment there, so let's see how the upstream
reacts.