Comment 6 for bug 1048230

Just a quick update to this bug: the issue persists with unity 6.6.0-0ubuntu1 and compiz 1:0.9.8.2+bzr3377-0ubuntu1. In the last few weeks I have not been able to reproduce this issue when using only the internal monitor, but it is 100% reproducible when an external monitor is connected. After the freeze has occurred, you can disconnect the external monitor, but the internal monitor changes from the frozen image to a black screen. It is possible to issue 'sudo killall Xorg' in tty1 and this brings you back to lightdm, but it kills all open windows and unsaved documents, so doesn't really help. The issue can also be reproduced using the guest session.

So just to summarize the steps to reproduce this crash:
- I have a dell mini 9 with an external monitor attached
- within a few minutes of normal usage the image on the screen will freeze (100% of the time)

(to speed up the last step you can eg open nautilus, browse to /usr/share, left mouse down on the handle of the overlay scrollbar, whilst holding the left mouse button down you can now make circle movements with your mouse which will cause nautlius to scroll up and down rapidly - this will cause the image on the screen to freeze within 10-60 seconds.)