[Bug 72212] New: Changing display mode while opening audio leaves audio unusable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72212

          Priority: medium
            Bug ID: 72212
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Changing display mode while opening audio leaves audio
                    unusable
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: lauri.myllari at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 90072
  --> https://bugs.freedesktop.org/attachment.cgi?id=90072&action=edit
kernel log from failed playback attempt

I am using xbmc on Haswell to play a video with DTS-HD/MA audio. If resolution
matching is enabled, sometimes audio playback fails with input/output error,
and any further attempt to open the audio device fails.

If I disable resolution matching, I don't encounter this issue and HBR audio
works fine.

I tried reproducing the issue with speaker-test and xrandr, but could not
trigger it. My guess is that it is very timing sensitive, and xbmc happens to
time the mode change and audio init just right.

I built a kernel with verbose sound debugging, and booted with drm.debug=0x0e.
I am attaching a log from a failed playback attempt. My kernel includes some
upstream patches, see linux-992.* in
https://github.com/laurimyllari/OpenELEC.tv/tree/77faefac8ef51d9434a918ba4bb12deddaa9e416/packages/linux/patches/3.12.1

I have also tried using 3.13-rc1.

Is it obvious from the log what's happening? If not, what would be the best way
to provide useful information?

(The log is a bit verbose, but some points of interest may be at 81.199631
where ELD is not yet available, 81.499301 retry after 300ms, 81.571388 fifo
underrun and 91.489083 playback write error)

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