Comment 47 for bug 1301125

Reading this thread there seems to be 2 distinct bugs.

I am getting the really bad one (frozen keyboard so no access to tty on the machine, only remote ssh and restart lightdm possible to get access again) on a HP 5750 AMD64 Athlon x2.

System hangup occurs when the screen locks after going idle for a while, or when switching between two logged on users.

This didn't happen with 14.04 i386, so for this hardware it's specific to 16.04 (both with i386 and i686).

I installed debug symbols for unity/compiz/lightdm.
Attaching with gdb on unity or compiz doesn't yield any stack.
Attaching to lightdm gives the same stack after and before system hangup (see attachment).

Any help greatly appreciated!