When PulseAudio runs as a part of a session, the "exit-idle-time" value should be ignored, so that PulseAudio doesn't stay running after the session has ended. I believe the exit-idle-time option exists only to handle the cases where PulseAudio is autospawned outside a proper login session. In those cases exit-idle-time is needed, because otherwise PulseAudio would either run forever or exit immediately after the first client exits, neither of which is good. Earlier discussion about this bug: http://thread.gmane.org/gmane.comp.audio.pulseaudio.general/16669
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