[Bug 77677] HDMI audio on ati7750 choppy with ALSA multi-channel apps

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=77677

--- Comment #19 from Andy Furniss <adf.lists@gmail.com> ---
I've just changed my HD4890 for a R9 270x, which is roughly AIUI a 7870 and
have hit this issue.

Testing with mplayer I do have some differences, but would probably get duped
if I posted a new bug so -

Kernels tested drm-fixes -

3.15.0-rc2-41381-gabaafc0
3.13.0-rc6-14283-g61ef8be
3.12.0-rc7-01267-g3d3b78c

Both working and non working cases show the same alsa h/w params which is the
same as my old card which always worked eg.

access: RW_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 48000 (48000/1)
period_size: 1024
buffer_size: 16384

With mplayer as long as there is video it seems to work OK (20 mins longest
test so far).

Pure audio files or "working" video played with -vc null always fail and sound
like the mp3.

-vo null without -vc null always works OK.

Only s/w decode works, UVD will produced trashed sound, so if that's the
default for xbmc it could be something worth testing.

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