Public bug reported:

When running Hardy, my laptop (Dell Latitude D420) screen occasionally
dims (back light intensity is decreased) regardless that the computer is
not idle. Back light can be returned by adjusting the screen brightness,
but it does not return automatically. I suspect that the problem is that
power management does not correctly detect when the computer is in use.

This problem did not occur with Gutsy.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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Laptop screen dims after several minutes of use
https://bugs.launchpad.net/bugs/206980
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