[pulseaudio-tickets] [Bug 86262] severe underruns with usb audio, works with pa 3.0 - buffer setup seems wrong

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86262

--- Comment #2 from David Mansfield <freedesktop-bugzilla at dm.cobite.com> ---
Created attachment 109438
  --> https://bugs.freedesktop.org/attachment.cgi?id=109438&action=edit
force tsched even in "BATCH" mode and on KVM.

The attached patch fixes the problem by essentially reversing commit
826c8f69d34ef49e86fe0ab6c93c1ffba8916131 (alsa: Disable timer-scheduling for
PCMs with the BATCH flag).

Without tsched, the buffers are miniscule and we get overruns constantly.  With
tsched (by design) the buffers are huge.  

Not sure what the implications are.

NOTE: I also forced enablement of tsched on KVM.  I'm having the exact same
problem in a VM, and it is MUCH better with the patch although still not
"glitch-free" which it is (with the patch) on bare-metal.

NOTE: In kvm I am using USB passthrough, not emulated hardware audio device.

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