Comment 8 for bug 446632

It seems that everyone with this bug has an ATI graphics card, so this may be a problem with the ATI-specific part of mesa. You may test with xorg-edgers (https://launchpad.net/~xorg-edgers/+archive/ppa), since that has the newest development version of mesa. Xorg-edgers on Jaunty has the same mesa version, so if this is the problem and it is still present with Karmic with xorg-edgers, it should also be a problem with Jaunty with xorg-edgers.

Also, at https://launchpad.net/ubuntu/karmic/+source/mesa there is a list of mesa versions that was published during the karmic release cycle. It seems there are still debs available for download. The source package mesa builds many binary packages, so there are a quite a few debs that has to be installed for each version. Another option is to build the source package (something like dpkg-source -x mesa-xyz.dsc; cd mesa-xyz; debuild -b -us -uc; cd ..; dpkg -i -O *.deb). If downgrading mesa helps, we know that mesa is the problem.