This might be a long shot, but you have these messages in your dmesg:
[ 5391.021483] ath5k phy0: noise floor calibration timeout (2412MHz)
[ 5391.733816] ath5k phy0: noise floor calibration timeout (2417MHz)
[ 5392.445978] ath5k phy0: noise floor calibration timeout (2422MHz)
[ 5511.022563] ath5k phy0: noise floor calibration timeout (2412MHz)
[ 5511.751707] ath5k phy0: noise floor calibration timeout (2417MHz)
Could it be that the wireless blocks the kernel for a long time, and
that is causing the underruns? If you disable the wireless, does that
make the dmesg messages and/or the underruns go away?
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
--
[USB-Audio - USB Audio CODEC ] Playback problem
https://bugs.launchpad.net/bugs/579117
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
