** Description changed: - This is for tracking purpose. + [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.
** Summary changed: - There is no available audio entry in sound settings after execute suspend in 'Performance mode' + [SRU]There is no available audio entry in sound settings after execute suspend in 'Performance mode' -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1887610 Title: [SRU]There is no available audio entry in sound settings after execute suspend in 'Performance mode' To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1887610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
