Description of problem:
In F12 this driver worked fine; in F13-Beta it does not.
Version-Release number of selected component (if applicable):
09:00.0 Audio device: Creative Labs X-Fi Titanium series [EMU20k2] (rev 03)
I have no idea what other info might be needed to diagnose this.
I discovered that disabling the on-board realtek device in the BIOS
"solved" the problem. Which means it never was a kernel bug, but one
somewhere in the user-level routing of the sound.
Closed, and I'll open a new bug against pulseaudio.