Tonight I had a few minutes to experiment.

I decided to try VLC as it is a different kind of audio client, lots of
things to tweak, and it knows about pulse audio.

So I installed it, and picked a directory, and started playing it.
Below is the log file info related to a stutter.  Note the first audible
stutter occurred where the pulseaudio messages happened.  Since then I
have had stutters that seem only to be linked to the ath5k message.  See
pulseaudio complaining about being woken up for no reason (I get that,
happens to dads, too).

Aaaaaaaaanyway... David, is there something I can do to get rid of this
ath5k problem, since it seems to be so linked to the whole mess?

Jun 30 19:24:32 temuko kernel: [ 1901.549765] ath5k phy0: noise floor 
calibration timeout (2412MHz)
Jun 30 19:24:33 temuko kernel: [ 1902.270582] ath5k phy0: noise floor 
calibration timeout (2417MHz)
Jun 30 19:24:33 temuko kernel: [ 1902.989994] ath5k phy0: noise floor 
calibration timeout (2422MHz)
Jun 30 19:26:32 temuko pulseaudio[1298]: alsa-sink.c: ALSA woke us up to write 
new data to the device, but there was actually nothing to write!
Jun 30 19:26:32 temuko kernel: [ 2021.549973] ath5k phy0: noise floor 
calibration timeout (2412MHz)
Jun 30 19:26:32 temuko pulseaudio[1298]: alsa-sink.c: Most likely this is a bug 
in the ALSA driver 'snd_usb_audio'. Please report this issue to the ALSA 
developers.
Jun 30 19:26:32 temuko pulseaudio[1298]: alsa-sink.c: We were woken up with 
POLLOUT set -- however a subsequent snd_pcm_avail() returned 0 or another value 
< min_avail.
Jun 30 19:26:33 temuko kernel: [ 2022.274829] ath5k phy0: noise floor 
calibration timeout (2417MHz)
Jun 30 19:26:33 temuko kernel: [ 2022.629104] ath5k phy0: noise floor 
calibration timeout (2417MHz)
Jun 30 19:26:34 temuko kernel: [ 2023.294463] ath5k phy0: noise floor 
calibration timeout (2422MHz)

-- 
Wireless blocks USB-Audio, leading to dropouts
https://bugs.launchpad.net/bugs/579117
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