Comment 11 for bug 1301125

I experience this issue as well. It happens with Ubuntu 14.04 when leaving the computer idle long enough for it to lock the screen due to idle timeout. It does not happen every time it goes idle, but every now and then. More often the past couple of months.

The only resolution that I know of is to do CTRL-ALT-F1, log in and do "sudo service lightdm restart", or to reset the computer, but such a resolution is fatal to all running applications and open documents.

I also see others experiencing the same issue, for example in http://ubuntuforums.org/showthread.php?t=2214421.

What other information is required in order to get this bug triaged?