Do you dual boot into Windows? This seems to be the cause of the problem for myself, at least - in Ubuntu 64bit (12.04.2LTS Precise and 12.10 Quantal), dual booting from Windows 7.
After having this same bug I have found a way to reproduce the problem: -Boot into Windows, turn headset on, restart into Ubuntu and try adjust the volume with the volume wheel In this case it almost always will cause similar GUI unresponsiveness to what you described. Possible workaround: -When in Windows or before booting into Ubuntu, turn off the headset -> boot into Ubuntu -> turn on then headset Note: Restarting Ubuntu once the headphones were previously turned on in Ubuntu does not cause it to become unresponsive (only when restarting from windows). Disconnecting the wireless receiver does not count as turning off the headset -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-input-evdev in Ubuntu. https://bugs.launchpad.net/bugs/1155819 Title: Plugging in Logitech G930 USB headset breaks mouse click behaviour To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-evdev/+bug/1155819/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
