I had some trouble with my audio output lagging for a couple seconds when using my USB headset with Pulseaudio 0.9.21 on Arch Linux. It turned out to be a problem with the Pulseaudio suspending the USB headset when it was idle. Commenting out module-suspend-on-idle in /etc/pulse/system.pa and /etc/pulse/default.pa is a quick fix, but it removes support to USB suspend.
It turns out that there was a bug in Pulseaudio that’s fixed in git upstream, but not yet released. Apply the patch to 0.9.21 and re-compile to fix the problem.
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