Comment 27 for bug 747187

Christopher M. Penalver,

I'm afraid the issue is still there and has been since at least Ubuntu 10.10.

After installing Ubuntu 12.04-beta2 on a flashdisk and package update yesterday, I still get screen blank and sleep issues, that eventually end in a lockup. Some of these issues might easily be X, Compiz, Mesa or Unity bugs.

Blank doesn't really work, as it does a fake switch to console, while keeping the mouse cursor active and waking up the disabled internal monitor. I have to do a switch to a real console and back to get to my X session. Display sleep works, but sometimes, especially after a longer sleep period, it won't wake up. Also, when I leave both monitors enabled, windows tend to move from external monitor to internal after blank/sleep - wake up. But this should be a Compiz/Unity issue.

Moreover, during this bug update i found another bug message in dmesg. This time the system survived. Running apport again.

Will try mainline kernel later.

PS: Apport crashed on me during the first bug update today, so some things might be damaged or missing.