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

[bugzilla-daemon at freedesktop.org]

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

          Priority: medium
            Bug ID: 77677
          Assignee: dri-devel at lists.freedesktop.org
           Summary: HDMI audio on ati7750 choppy with ALSA multi-channel
                    apps
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: socalfisher at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Radeon
           Product: DRI

Created attachment 97618
  --> https://bugs.freedesktop.org/attachment.cgi?id=97618&action=edit
Alsa No Pulseaudio xorg.0.log dmesg aplayL/l codec logs

I am having issues playing sounds over HDMI stereo directly to TV.  I am using
XBMC.

When Pulse Audio is installed the sounds play fine in stereo.  When I try a
pure alsa installation (no pulse audio) there is severe distortion.  Pure ALSA
is needed for applications that only support ALSA, and for HDMI pass-through.

My dedicated Radeon 7750 card only outputs cyclical sounds, quiet voices like
wrong channel, and echos. Setup PC to TV directly HDMI (2.0 audio selected). I
have had the same issue when cpu was an AMD 955BE, and now Intel i7 4770.

Windows 7 plays hdmi audio just fine on the same exact PC/Panasonic
plasma/setup.  

1) speaker-test -l 4 -c 2 -r 48000 -D hw:1,3  plays choppy sounds with or
without pulse installed.

2) aplay -D plughw:1,3 /usr/share/sounds/alsa/Front_Center.wav plays fine

Using an A4-3400 HDMI plays perfectly fine on the same TV.  As does my Zotac
AQ01.

Not sure if this is related (http://ubuntuforums.org/showthread.php?t=2207698):
 SND_PCM_ACCESS_RW_INTERLEAVED vs. SND_PCM_ACCESS_MMAP_INTERLEAVED

I believe XBMC uses SND_PCM_ACCESS_RW_INTERLEAVED for ALSA.

Thanks in advance.

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