[unstable] Pipewire sound dropouts on wayland | nvidia -> pipewire -> displayport

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1

Hello community,

i am on the unstable branch, using nvidia only, and enabled wayland with the latest gpu drivers on Gnome.

I cannot say what it is exactly.

Verbose log of pipewire is normal.
Firefox also beside the known errors of mp4parse.

Symptom:

  • Video plays normal.
  • Randomly the sound softly goes down, but very fast
  • After ~1sec it plays further as normal
  • Similar to skipping to a new start point of a clip where it starts, but while playing constantly.

Results:

  • Firefox in Youtube: :x:
  • Firefox in Invidious: :x:
  • Download and watch with mpv: :x:

ok well now I have 2 audio devices:

  • Internal AMD FCH Azalia over jack connection. :white_check_mark:
  • External NVIDIA GP107GL High Definition Audio over Display Port :x:

:notebook: I switched off ASPM with TLP.

So my conclusion is, that it is a problem with

nvidia -> pipewire -> displayport

But I cannot narrow it down any further. I didn’t experience the problem on xorg.

Does anyone have an idea or found something that explain that behavior?

Meanwhile I will use the internal audio device.

Thank you for reading and suggestions.

2

Wayland and Nvidia do not work together, I guess.
Maybe you can report the problem to Nvidia developers if they can support pipewire on Wayland.

3

ok I have maybe the root problem…

I run pipewire with triple -v now and the journal reveals me this when a dropout happens:

Dez 09 14:52:43 pipewire[13524]: spa.alsa: 0x55ff47134f88: early wakeup 1021 1024
Dez 09 14:52:43 pipewire[13524]: spa.alsa: front:0: follower:0 match:0 rate:1,001412 bw:0,128000 thr:1024 del:1024 target:1024 err:0,000000 max:512,000000
Dez 09 14:52:43 pipewire[13524]: spa.alsa: hdmi:1,1: follower:0 match:0 rate:1,000016 bw:0,128000 thr:1024 del:1024 target:1024 err:0,000000 max:512,000000
Dez 09 14:52:43 pipewire[13524]: spa.alsa: 0x55ff47134f88: early wakeup 1023 1024
Dez 09 14:52:44 pipewire[13524]: spa.alsa: 0x55ff47134f88: early wakeup 1022 1024
Dez 09 14:52:44 pipewire[13524]: spa.alsa: 0x55ff47134f88: early wakeup 1022 1024
Dez 09 14:52:44 pipewire[13524]: spa.alsa: front:0: follower:0 match:0 rate:0,999993 bw:0,128000 thr:1024 del:1023 target:1024 err:-1,000000 max:512,000000
Dez 09 14:52:44 pipewire[13524]: spa.alsa: 0x55ff47134f88: early wakeup 1023 1024

Looks like a slight resynchronization of audio output…

4

No, it seems to work good enough at this stage even with nvidia. But well I am just testing at the moment.

Guess the problem is not the nvidia driver, since the audio device is running with snd_hda_intel.

5

Puh… no idea what the actual problem was, but it seems again “power saving” *urgh*

I comment out:

File: /etc/modprobe.d/mhwd-gpu.conf

#options nvidia "NVreg_DynamicPowerManagement=0x02"

I added snd_hda_intel and the device 01:00.1 to the deny list:

File: /etc/tlp.conf

RUNTIME_PM_BLACKLIST="01:00.1"
RUNTIME_PM_DRIVER_BLACKLIST="amdgpu mei_me nouveau nvidia pcieport radeon snd_hda_intel"

My guess is that it was the nvidia option in modprobe.

Now it works without interruption. At least I don’t hear it anymore.

6

No, it happens not that often anymore, but happens noticeably.