Crackling audio on Raspberry Pi Desktop

[Dave Jones]

Attempting to play audio (e.g. from rhythmbox) on the raspberry pi desktop image, results in broken up / crackling audio. The "tsched=0" workaround noted in https://wiki.ubuntu.com/Audio/PositionReporting#Turning_off_PulseAudio_timer_scheduling successfully avoids the issue.

[Daniel van Vugt (vanvugt)]

I will assume this is groovy.

[Daniel van Vugt (vanvugt)]

Dave, can you please report the issue to the developers:

  https://gitlab.freedesktop.org/groups/pulseaudio/-/issues

and then tell us the issue ID?

[Dave Jones (waveform)]

Hmm, this looks like someone reported exactly this about a year ago:

https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/762

Unfortunately it's closed with "approach the driver maintainer".

[Dave Jones (waveform)]

Worth noting that this issue only appears to occur when the fkms ("fake" KMS) overlay is in use on the Ubuntu Desktop for Raspberry Pi images. Under the kms ("full" KMS) overlay, the audio is fine. While kms is indeed the default overlay, it is likely (due to LP: #1946368 on impish) that many may be using fkms as a workaround.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Dave Jones (waveform)]

Closing as we're now using "full" KMS on all supported desktops