My netbook running 11.10 ubuntu goes to sleep after 10 minutes of inactivity as per settings. After the screens dims, I cannot get the backlight to come back on. I can see the faint text of the screen. Any clues?
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There is already a bug report on Launchpad for your problem and I think that it should be solved soon; if you can't wait, there are some tricks suggested in the comments of that bug.