https://bugs.freedesktop.org/show_bug.cgi?id=90777
--- Comment #9 from Shimi Chen shimi.chen@gmail.com --- My HDMI audio also does not work since 4.0. I tried installing the mainline 4.2rc3 kernel and it is not fixed. Reverting to 3.17.6 fixes the issue. I'm using Arch Linux and a laptop with Radeon HD 4570.
Should I report a separate bug?