Comment 107 for bug 608907

It might be this bug resurfaced somewhere else:

Running 11.04 with the 2.6.38-8-generic kernel in Ubuntu Classic mode, the system boots okay without any tweaks (out-of-the-box). Having the screen-saver coming up is no problem either. But: when you close the lid and let the system closed for some time, opening the lid again presents you a black screen with the backlight on.

Some sources indicated going to compiz manager: OpenGL plugin: uncheck "Sync to VBlank", but this seems to be a completely unrelated issue with the system freezing after a lid-close but here the system seems to continue running properly behind a black screen!

I anyone more aware of all the display related bugs feels this needs to be a new bug, please open one and link us up.