It does not seem to be xorg-related because: a) If X is forced to restart using ctrl-alt-backspace when the mouse is frozen, the mouse remains frozen when X comes up again.
b) I've seen reported in the forum that the gpm mouse in the text console freezes just the same. I have not confirmed this myself, though. ** Changed in: xorg (Ubuntu) Sourcepackagename: xorg => linux-source-2.6.11 -- Mouse pointer freezes in Dell Dimension E521 / nForce 430 https://launchpad.net/bugs/67734 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs