I can confirm this issue on my UX32VD running Ubuntu 13.04.
However I don't know how this issue could be solved. The BIOS tells us
the maximum brightness value accepted but the minimum accepted value is
always 0. The actual behaviour of the different brightness values is
decided by the hardware, that means we have no way of knowing whether 0
means backlight off or minimal backlight on a specific machine, unless
by maintaining a list of hardware that turns backlight off when
brightness is 0.
** Changed in: gnome-control-center (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1093325
Title:
Lowest brightness setting renders screen black
Status in “gnome-control-center” package in Ubuntu:
Confirmed
Bug description:
I see the logic in that the lowest brightness would be 0. But in
reality, it seems a very impractical solution. Dragging the slider to
0 and then not being able to turn it up again (my hotkeys don't work
-- kernel related issue.) I would propose that the lowest setting
indeed is very dark, but not completely black.
This problem appears on an Asus UX32VD, running Ubuntu 12.10.
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