[Bug 86351] HDMI audio garbled output on Radeon R9 280X

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=86351

--- Comment #8 from Andy Furniss <adf.lists at gmail.com> ---
(In reply to Alex Deucher from comment #7)
> If you are using CPU governor, does forcing the CPU power state to a stable
> state help?

No, I've tried many things as recorded in the FDO bug I linked.

It's certainly a strange one, but the only way to get working sound I've found
is to have enough CPU load across all my CPUs (just maxing one won't do).

By luck for me my only real use case is HDTV and decoding in s/w is enough
load.

When there is no load it's like just one chunk of buffer gets repeated and this
may initially contain old sound from a previous loaded run.

Doing not much will advance the buffer. With more, but not enough, load the
sound is almost OK, but there is a bit of crackle.

This does seem to need purely CPU load, as I said in the other bug I can
reproduce from fbcon without X and temporarily "fix" the sound my compiling
something with make -j5.

My CPU is AMD Phenom II x4 965be, but IIRC others have seen this with intel.

Whether working or not interrupt counters rise at the same rate.

Previous card = HD4890 didn't have the issue in the same box with the same TV
with almost the same s/w.

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