[ubuntu] very dimmed screen

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http://ubuntuforums.org – very dimmed screen sometimes I have reported this error before, but thought that I had it figured out but it was only partly. I am running Ubuntu 11.10 on my old HP laptop. When I leave the laptop on power unattended it goes into a sleeping mode despite the fact that I in setting have specified that it should not suspend. When I try to start the laptop again it starts, but the screen is so dimmed that you can't do anything. I will thenn have to force a shut down by holding the power switch off for a time. I might have to do this a couple of times before I finally manages to get the (Hardware)