`SleepInhibitor::acquire` runs on every Playing state update and retried
the `Inhibit` call each time it failed. On a headless daemon with no
logind session polkit answers `InteractiveAuthorizationRequired` forever,
which produced one WARN every ~2 s (369 lines in 11 min on the Pi smoke,
2026-08-29). Classify the failure: a policy denial is logged once at info
and never retried for this process; a transient error backs off 5 min.
Playback was never affected.
cc
vicrodh
a9c886b0d3