After last Friday(20/01/2012) update, when I turned on my laptop today I got a black screen on it. It is on, I can see the back light, but it's all black only my secondary display is ok.
Screen is Ok, when I reboot I can see Dell logo a Ubuntu colored screen before login but then... black. I need to attach secondary monitor to do anything.
I saw A lot of issues with Nvidia but mine is Intel Graphics.
I was already on 11.10 just did an update.