Public bug reported:
[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.
** Affects: pulseaudio (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
[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 is
intended. I also don't find any regression during some smoke test.
+ 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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https://bugs.launchpad.net/bugs/1855893
Title:
Properly let PCM leave suspended state when hardware doesn't support
PCM resume
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