Comment 28 for bug 775345

I am not sure whether this will help anyone, but I have just checked my laptop, which is also running 11.04 (the comment above relates to my desktop).

The laptop was last updated on 28 June, and works fine.

The desktop has had 3 updates since then and exhibits the problems described in #27

Pure guesswork, but the most likely candidate seems to be the update on the 30 June, principally because it contains firmware and kernel updates.