I finally observed the problem in another operating system! It was harder to spot because it was nowhere near as bad as it was in Ubuntu, but it must be a hardware or firmware problem that the recent shop tests failed to detect.
** Changed in: xserver-xorg-video-nouveau (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/704944 Title: Mouse control gone crazy -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs