I'm sure Mariusz Kielpinski meant that it's no solution to the 99% of
the people who have experienced this problem. That is, the people who
have experienced it and did not care enough to go hunting around for a
random solution on a bug tracking site. That's not what "Linux for human
beings" means.
As has been noted before, this problem seems to affect many Dell
laptops. I'm surprised it hasn't been fixed yet, seeing as how it's
fairly noticeable.
Anyway, I fixed it by following
http://ubuntuforums.org/showthread.php?t=358432
which is pretty much the same advice. Specifically, what I've do