I'm running 11.04 on a 2011 13" mackbook pro (intel hd 3000 gpu).
Previously everything had been fine, but today when I plug in an external monitor (17" Acer being plugged in via a mini display port to VGA adapter) the laptop immediately recognizes the monitor, but the screen turns black. It seems that everything is still responsive. I can see the cursor and I can see it change as it moves over things like text boxes or the edges of open windows. But even after unplugging the monitor, I can't get anything but a black screen until I restart gdm.
Yesterday I was using the laptop with a 22" Asus monitor using a mini display port to DVI adapter and everything was fine. This same monitor was also working fine last week when I was running OS X, and on an older HP laptop without an adapter (straight to VGA).
How can I fix this?
Best Answer
Just found the official bug page, with possible workarounds such as installing other kernel versions: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/745112
For the time being, it seems we have to wait or play with other kernels...
EDIT: I've just installed and tried kernel
linux-headers-2.6.39-020639rc4and works like a charm - at least in this regard. I hope it's as stable as the previous one as well!