[Bug 1887610] Re: There is no available audio entry in sound settings after execute suspend in 'Performance mode'

[Hui Wang]

@sponsor-team,

This is the debdiff for focal. And let's SRU this fix to groovy and
focal first, because our oem project is waiting for the fix to be landed
to focal.

And since groovy is not released yet, I don't provide the debdiff for
groovy, and I already pushed the fix to git repo (groovy branch, focal
branch, eoan branch and bionic branch).


** Patch added: "pulseaudio_13.99.1-1ubuntu3.5.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1887610/+attachment/5392771/+files/pulseaudio_13.99.1-1ubuntu3.5.debdiff

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Title:
  [SRU]There is no available audio entry in sound settings after execute
  suspend in 'Performance mode'

Status in HWE Next:
  New
Status in pulseaudio package in Ubuntu:
  Confirmed
Status in pulseaudio source package in Bionic:
  Confirmed
Status in pulseaudio source package in Eoan:
  Confirmed
Status in pulseaudio source package in Focal:
  Confirmed
Status in pulseaudio source package in Groovy:
  Confirmed

Bug description:
  [Impact]
  On some I+N machines (inlcuding lenovo and dell machines), after
  setting the graphic mode to perofermance mode, and open the gnome
  sound seting, run suspend/resume test, the audio devices will
  disappear from UI, instead a dummy audio shows on the UI, and from
  then on, the audio can't work anymore.

  [Fix]
  The root cause is after resuming, the pulseaudio try to recover the
  PCM device, but at that moment, the devices nodes at /dev/snd/ are
  not accessible yet sometimes, it will make snd_pcm_open fail and
  the pulseaudio will calll unload_module to unload alsa audio card.
  I cherrpicked a fix from upstream, the fix adds retry and pa_msleep(),
  this will retry the snd_pcm_open() a couple of times if it fails.

  [Test Case]
  Install the pulseaudio wit this fix, set the graphic mode to
  performance mode, open the sound setting, then run suspend/resume 90
  times, after test check the audio devices on the UI, the speaker,
  digital mic are still on the UI, and they could work well.

  [Regression Risk]
  Low, this SRU just add retry and pa_msleep(), if the snd_pcm_open()
  doesn't fail, this patch will not introduce any change, if snd_pcm_open()
  fails, it just retry a couple of times, so it will not introduce the
  regression in theory.

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