Happy user of 12.04 desktop since its released, but recently - past couple of months my UI randomly freezes.
Mouse pointer moves, but can not click Keyboard is completely gone Screen painting looks normal - no other display aberrations.
Ctrl-Alt f2/f3 etc work fine and I can use keyboard on terminal prompt, however if I get back to UI display using Ctrl-Alt f7, nothing works. Looks like lightdm or something underneath looses connections with peripheral. Without knowing too much internals, I am thinking it can not be any lower than that since keyboard work on terminals.
There are no log entries of anything crashing in syslog, kern.log and dmesg.
Restarting lighdm forces logout from ui. I can log in after entering my credentials, but after that nothing works.
Is there a way to gracefully restart whatever is causing the problem so that I don't have restart my machine. I really hate to loose all my unsaved work especially when crash happens on something innocent like right on eclipse menu.
Normally noticed the crash when displaying eclipse context menu - right click on some eclipse view. But not everytime. Might be because I spent lot of time in eclipse.