I use a Lenovo Y560 on Natty Narwhal. And I see this issue every time.
Basically even if I set the brightness to 80-100% after a few seconds
the brightness will automatically dim to 10-20%. Sometimes after the
dim, the brightness will randomly go up again (without manual
intervention).

This is on a fully active computer on AC power . So dim when idle should
not take effect anyway. I have tried all possible combinations with
gnome-power-manager e.g. disabling the dim when idle check box, setting
default brightness to a lower level etc.

Please let me know if you need further information. I do not consider
myself as an expert ubuntu user, but if you can tell me how to get those
information I can surely try to do it. This problem is annoying as hell.

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https://bugs.launchpad.net/bugs/355180

Title:
  [jaunty] screen brightness dims on AC power despite config to leave at
  100%

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