I observe similar problem. Time to time keyboard stops working. I can restore normal function by switching workspaces using mouse. In the keyboard-less state gksu won't work complaining: "Cannot grab your keyboard".
It started after I upgraded to upstart. -- After upgrading to upstart on Edgy, keyboard stops working after logging in via gdm https://launchpad.net/bugs/59616 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
