There are a few strange things in that log, e g these:

E: alsa-sink.c: ALSA woke us up to write new data to the device, but there was 
actually nothing to write!
E: alsa-sink.c: Most likely this is a bug in the ALSA driver 'snd_emu10k1'. 
Please report this issue to the ALSA developers.
E: alsa-sink.c: We were woken up with POLLOUT set -- however a subsequent 
snd_pcm_avail() returned 0 or another value < min_avail.

D: alsa-sink.c: Requested volume: 0:  49% 1:  49% 2:  49% 3:  49% 4:  49% 5:  
75%
D: alsa-sink.c: Got hardware volume: 0:  50% 1:  50% 2:  49% 3:  49% 4:  49% 5: 
 63%

If there is a bug in the ALSA driver, you can try to install linux-
backports-modules-alsa-karmic-generic and reboot afterwards, that'll
update your sound drivers.

-- 
PulseAudio completely ruins all audio
https://bugs.launchpad.net/bugs/455779
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