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[ubuntu] Can't adjust brightness on Acer Aspire 5738 running Karmic

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http://ubuntuforums.org – Can't adjust brightness on Acer Aspire 5738 running Karmic. The same happened under Jaunty. The screen never seems to reach its full brightness and it flickers. The notify osd shows a bright bar indicating the screen brightness increasing or decreasing when I use the fn key + the corresponding keys for increasing or reducing the screen brightness, but the screen always stays the same. I can move the arrow in the brightness applet in the Gnome panel up and down, but nothing happens, either. I think I'll report a bug. (Hardware)