Hi,

I have been able to get around this bug on IBM T60/x1400 running Kubuntu
12.04, by using kwin_gles desktop manager instead of the default one
(kwin).

I had problems with sound slowing down and being very choppy when
desktop effects were enabled, or when playing full-screen flash videos.
I did not notice any problems with wifi. With kwin_gles I have
absolutely no sound issues with desktop effects enabled.

How to change the window manager see: 
http://weits.blogspot.cz/2012/02/kwin-gles-as-default-window-manager-in.html

I'm not X expert, so please take the following lines as my humble
opinion. I belive, that the workaround is caused by the fact, that
kwin_gles uses EGL for rendering, while kwin uses GLX. So maybe this bug
can be avoided on other distros and window managers by setting them to
use EGL instead of GLX.

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https://bugs.launchpad.net/bugs/564376

Title:
  Lucid - radeon kms causes iwl3945 to drop connection on youtube but
  not with mainline

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