I had the same bug using latest Ubuntu Lucid (i386).
I fix the problem after installing latest maverick kernel from ppa:kernel-ppa/ppa (linux-image-generic-lts-backport-maverick 2.6.35-12-generic)
sudo add-apt-repository ppa:kernel-ppa/ppa sudo aptitude update sudo aptitude install linux-image-generic-lts-backport-maverick
I had the same bug using latest Ubuntu Lucid (i386).
I fix the problem after installing latest maverick kernel from ppa:kernel-ppa/ppa image-generic- lts-backport- maverick 2.6.35-12-generic)
(linux-
sudo add-apt-repository ppa:kernel-ppa/ppa generic- lts-backport- maverick
sudo aptitude update
sudo aptitude install linux-image-