i now have:
$ cat /etc/modprobe.d/sound 
options snd-hda-intel position_fix=1
$

but it don't fixes the bug, the sound-file was not there before....so i
created it

from user.log:
Mar 31 21:03:38 infrared pulseaudio[3711]: alsa-util.c: Disabling timer-based 
scheduling because high-resolution timers are not available from the kernel.
Mar 31 21:03:38 infrared pulseaudio[3711]: alsa-util.c: Disabling timer-based 
scheduling because high-resolution timers are not available from the kernel.
Mar 31 21:03:51 infrared pulseaudio[3850]: alsa-util.c: Disabling timer-based 
scheduling because high-resolution timers are not available from the kernel.
Mar 31 21:05:30 infrared pulseaudio[3850]: alsa-sink.c: ALSA woke us up to 
write new data to the device, but there was actually nothing to write!
Mar 31 21:05:30 infrared pulseaudio[3850]: alsa-sink.c: Most likely this is a 
bug in the ALSA driver 'snd_hda_intel'. Please report this issue to the ALSA 
developers.
Mar 31 21:05:30 infrared pulseaudio[3850]: alsa-sink.c: We were woken up with 
POLLOUT set -- however a subsequent snd_pcm_avail() returned 0 or another value 
< min_avail.

-- 
ubuntu-bug alsa-base Popping Clicking Pulse Audio crashing
https://bugs.launchpad.net/bugs/551949
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