** Patch added: "pulseaudio_11.1-1ubuntu7.6.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1855893/+attachment/5311477/+files/pulseaudio_11.1-1ubuntu7.6.debdiff

** Tags added: oem-priority originate-from-1849812 somerville

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https://bugs.launchpad.net/bugs/1855893

Title:
  Properly let PCM leave suspended state when hardware doesn't support
  PCM resume

Status in HWE Next:
  New
Status in pulseaudio package in Ubuntu:
  New

Bug description:
  [Impact]
  Headset Mic plugged into Dell WD19TB dock stops working after suspend/resume.

  [Fix]
  According to alia-lib's document, to make PCM properly leave suspended state, 
we only use snd_pcm_resume() if hardware support PCM resume.
  For hardware that doesn't support PCM resume, like snd-usb-audio on WD19TB 
dock, we should use snd_pcm_prepare(), snd_pcm_drop() or snd_pcm_drain() to 
make device leave suspended state. This patch defaults to use snd_pcm_drop() to 
achieve the goal.

  [Test]
  1. See if microphone on snd-usb-audio works in gnome-control-center/cheese.
  2. Suspend/resume.
  3. See if microphone still works in those apps.
  I can the issue is fixed after each suspend/resume cycle.

  [Regression Potential]
  Low. This fix makes PCM suspend/resume more reliable. No functional change 
intended. I also don't find any regression during some smoke test.

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