[lubuntu] sudden blackout crash

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http://ubuntuforums.org – About an hour ago, my screen suddenly went nearly black (black but still powered on) and no key sequences like ctrl-alt-f1 did anything. The only way out that still somehow worked was pressing and holding the power button, resulting in a shutdown. I don't know why it happened. I had 5 tabs open in Firefox, and two Leafpads open, so it could have been a lot of things. Every power manager option for suspend or hibernate was turned off, so it probably wasn't one of those. The question is how do I get a log report that would show what was going on in the computer when it happened? I've been looki (Hardware)