http://bugs.winehq.org/show_bug.cgi?id=29531
--- Comment #1 from Andrew Eikum aeikum@codeweavers.com 2012-01-04 11:03:21 CST --- There's a huge gap in the winealsa timer ticks:
(navigate directory) (several "tick"s) 22.374:0041:err:alsa:alsa_write_data tick 22.385:0041:err:alsa:alsa_write_data tick ... 22.569:0041:err:alsa:alsa_write_data tick
which causes an underrun and the audio glitches. The behavior was masked before because we put a whole bunch of data into the ALSA buffer, which was enough to bridge the large gap without an underrun.
There might be a problem with the timer code, but more likely we should be using a more reliable method to trigger our write() function periodically.