Public bug reported:
Pipewire tries to acquire a realtime priority when it starts via the
libpipewire-module-rt plugin. By default, it prefers to use the
org.freedesktop.portal.Realtime interface if xdg-desktop-portal is
running (it checks if org.freedesktop.portal.Desktop exists on the
session bus). If xdg-desktop-portal isn't running, it uses rtkit
directly - see
https://gitlab.freedesktop.org/pipewire/pipewire/-/tree/1.2.7/src/modules?ref_type=tags#L932.
I started looking at this because I have an annoying issue with my audio
which results in my speakers making popping noises frequently when
they're outputting anything. I have another issue where my USB speakers
are frequently not detected by pipewire without restarting it.
When pipewire starts with a new session, it acquires a realtime priority
by using rtkit directly because xdg-desktop-portal isn't running at this
stage. However, if you restart pipewire manually later on when xdg-
desktop-portal is running, pipewire uses the portal interface to request
a realtime priority, and this fails with xdg-desktop-portal outputting
the following error to the journal:
Apr 13 02:58:01 farnsworth xdg-desktop-por[7283]: Realtime error: Could
not get pidns: Could not fstatat ns/pid: Not a directory
The libpipewire-module-rt plugin does have an option to disable usage of
the portal interface for requesting a realtime priority
(rtportal.enabled=false).
This is tested with pipewire 1.2.7 in plucky.
** Affects: pipewire (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2107340
Title:
Pipewire fails to reacquire a realtime priority when restarted
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