[Bug 80162] New: center and lfe channels screwed up on suspend

[Bug 80162] New: center and lfe channels screwed up on suspend

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=80162

          Priority: medium
            Bug ID: 80162
          Assignee: dri-devel@lists.freedesktop.org
           Summary: center and lfe channels screwed up on suspend
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: pierre-bugzilla@ossman.eu
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Radeon
           Product: DRI

Started out in the kernel bugzilla as I figured this was an alsa driver
problem:

https://bugzilla.kernel.org/show_bug.cgi?id=77901

> AMD HDMI audio output. Works fine until I suspend the machine. After resume, center channel is silent and LFE channel is sent as center.
> 
> Massive issue as the center channel is the most used one of all in multichannel audio sources. :/
> 
> Unloading just snd_hda_intel and reloading it seems to work around the issue.

The verdict there though was that it didn't seem like the audio end was doing
anything wrong, so it must be something in the graphics driver.

Help?

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[Bug 80162] center and lfe channels screwed up on suspend

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=80162

--- Comment #1 from Alex Deucher <agd5f@yahoo.com> ---
AFAIK, video driver doesn't have anything to do with the mappings.  Does
forcing a modeset after resume help?  E.g., change the mode with xrandr and see
if that helps.  Maybe some of the AMD specific verbs in the hda driver need to
be reset?

http://amd-dev.wpengine.netdna-cdn.com/wordpress/media/2013/10/AMD_HDA_verbs_v2.pdf

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[Bug 80162] center and lfe channels screwed up on suspend

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=80162

--- Comment #2 from Pierre Ossman <pierre-bugzilla@ossman.eu> ---
Thanks. Going through the vendor verbs revealed the issue. Multichannel mode
was getting reset on suspend, and was not properly reinitialised by the driver
on resume.

Will prepare a patch for the ALSA folks. I guess you can close this bug entry
as invalid.

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[Bug 80162] center and lfe channels screwed up on suspend

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https://bugs.freedesktop.org/show_bug.cgi?id=80162

Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTOURBUG

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