Public bug reported:

The system's situation when the bug occurred.
• totem open, video paused, "always on top"
• Update Manager open, but Failed to download list of changes
• Epiphany open in the background with a google search waiting
• no internet connection

• then, I went to gnome-terminal and did a "sudo ifdown ra0 && sudo ifup
ra0" to connect to the internet again (due to another bug)

• the google search in the background failed because the interface went down
• then I clicked on Update Manager window because I wanted to see the latest 
changes, hoping my connectivity bug would be changed.

• that was the last input received.  I could move the mouse around, but
i didn't get any changing cursors or highlighted buttons or tooltips or
anything.  I couldn't click anything.  No key combinations worked.  alt-
tab didn't work.  ctrl-alt-backspace didn't work.  Capslock didn't even
change the state of the LED on the keyboard.

• I tried using my wacom tablet.  Same effect as the mouse.  I tried unplugging 
and replugging-in my (usb) mouse.  No effect.  VNC session also just mimicked 
the problem remotely.
• I was able to ssh into it from another computer and kill select processes but 
i couldn't figure out how to reset the X input devices....
• In the ssh session, I did: sudo invoke-rc.d gdm restart 
• Lost all my open documents but I got back to the login screen with working 
mouse and keyboard.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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can move mouse cursor, but keyboard and mouse input stop, computer continues 
functioning
https://bugs.launchpad.net/bugs/159582
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