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[Charles <2107340@xxxxxxxxxxxxxxxxxx>]

Downgrading the kernel in plucky didn't help, but I backported some
patches from upstream into plucky that has fixed the issue for me.
Uploaded a PPA for others to try:
https://launchpad.net/~charles05/+archive/ubuntu/ppa/+packages

** Merge proposal linked:
   https://code.launchpad.net/~charles05/ubuntu/+source/xdg-desktop-portal/+git/xdg-desktop-portal/+merge/488341

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https://bugs.launchpad.net/bugs/2107340

Title:
  Pipewire fails to reacquire a realtime priority when restarted

Status in pipewire package in Ubuntu:
  Triaged
Status in xdg-desktop-portal package in Ubuntu:
  Triaged

Bug description:
  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.

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