[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 #23 from Andy Furniss <adf.lists at gmail.com> ---
I don't have a 270X anymore which I was using when first commenting in this
bug.

My current R9285 Tonga also has this issue and I've just tried setting 2048
(runtime) for prealloc and it doesn't help me.

I do think this is a sound driver issue though as pulse audio works, though it
was a different test = with fglrx the issue is also present when using alsa but
not pulse.

The difference seems to be that alsa direct uses

SND_PCM_ACCESS_RW_INTERLEAVED

and via pulse it uses

SND_PCM_ACCESS_MMAP_INTERLEAVED

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