I finally found a solution that works for me!

I have T60 with Radeon x1400 and Kubuntu installed. When I use kwin_gles window 
manager instead of the default one (kwin), 
all sound problems are gone: Amarok plays without chopping even with desktop 
effects enabled, sound is not choppy when playing fullscreen flash videos.

Quick test if it works also for you is:

$ sudo apt-get install kde-window-manager-gles
$ kwin_gles --replace &

For a more durable solution see: http://weits.blogspot.cz/2012/02/kwin-
gles-as-default-window-manager-in.html

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/879790

Title:
  Sound doesn't play properly after upgrade from 11.04->11.10, also
  affects 12.04

Status in X.org XServer - ATI gfx chipset driver:
  Confirmed
Status in “alsa-driver” package in Ubuntu:
  Confirmed

Bug description:
  After the upgrade from Natty to Oneiric the sound that is played (by
  any program ex. banshee, VLC, Flash) sound very awkward, like if the
  whole sound is slightly gargling.

  My computer: Thinkpad T60

  Already tried to solve the problem: The german ubuntuforum has a wiki-
  page to solve sound problems
  (http://wiki.ubuntuusers.de/Sound_Problembehebung). Unfortunately,
  nothing helped - even a reinstalling of the Alsa-Module didn't solve
  the problem. Hence I think this is a bug.

  Special: In the thread that I opened in the german forum
  (http://forum.ubuntuusers.de/topic/nach-upgrade-11-04-auf-11-10
  -ueberschlaegt-der-ton/) there was another user that has the same
  Problem AND he has the same computer as I do. Therefore, I'm not sure
  if it is a computerspecific problem that may be connected with the
  chipset of the T60...

  Thanks
  Quesst

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