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[Phoenix87 <787208@xxxxxxxxxxxxxxxxxx>]

I "autospan=no"ed pulseaudio and killed the daemon with pulseaudio -k. I
guess this forces the system to switch to alsa, because sound seems to
be fine system-wide. This procedure seems to have solved the issue, for
the freezing part of the bug described above seems not to occur any
longer now. By the way a problem still exists that may not be related to
the pulseaudio package, because rhythmbox crashed and closed itself
while I was using it, and vlc suddenly stopped playing music and I was
unable to resume it by clicking on pause/play. I had to press stop and
then play again, and playback started again normally. The conclusion
I've come up with is thus the following: something in the media system
(i don't know exactly how this stuff works, but i presume it could be
something related to the X server) is causing a crash to occur while
some media file is playing on my system (this happens with both video
and/or audio media contents). Then the pulseaudio daemon responds badly
to this failure and makes the os unstable, as discussed above in the
original post of this but report.

Hope this helps.

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https://bugs.launchpad.net/bugs/787208

Title:
  computer becomes slow and unusable, and after a while freezes, while
  fans speed up