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The screen of my laptop (Dell Vostro 3460) supports 16 levels of brightness: Not only according to the manufacturer, but also as is clear from two OSs: Both Windows 7 and Ubuntu (dual-booted) support all levels. On Windows 7, the hotkeys for brightness adjustment support all levels.

In ubuntu it is apparent when going on the brightness slidebar (see picture below) from left to right; I can count 16 different levels of brightness when doing so.

The brightness slider of ubuntu

When using the hotkeys (Fn+F4 and Fn+F4), however, only 5 levels are supported. How can I adjust these levels and make them in line with what my screen supports?

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Do the Fn+F4 keys work when your screen is locked (password prompt), but turned on? I have the same problem on my System76 Pangolin Performance laptop. It seems that GNOME is grabbing the brightness keys and doubling the brightness change. When my screen is locked and showing the password prompt, the Fn+F5 and Fn+F6 brightness keys work normally, minus the on-screen notification. – Shane Oct 20 '12 at 3:42
That's weird. Indeed when the screen is locked the steps taken are smaller (yet not as many as in my screen supports). This obviously is a bug, but of what package, and where to report? – Koen Oct 20 '12 at 12:27

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