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I'm having a problem with notebook screen on Ubuntu 13.04(for what i remember it happened on 12.10 too), sometimes( i think at least, mostly when playing games) the monitor just powers off, but the system seems to be running, and there's no way i can turn it on again so i have to do a hard reboot. My video card is a Second Genaration Sandy Bridge(Intel HD 3000, i965). Anyone knows something about how can i debug more and/or solve it?

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