Hmm, when I was looking at the changelog for 2.6.25-rc1, I noticed the
following two changelogs and bug reports that may address this issue:
ACPI: video: Rationalise ACPI backlight implementation
http://bugzilla.kernel.org/show_bug.cgi?id=9277
It also addresses this second issue of having two video objects (though
it doesn't break anything for me):
ACPI: video: Ignore devices that aren't present in hardware
http://bugzilla.kernel.org/show_bug.cgi?id=9614
I would like to see this change incorporated into the Hardy kernel -- and
backported to Gutsy, if at all possible.
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LCD backlight turns off when between discrete levels, both from hotkeys and
from dim-on-idle.
https://bugs.launchpad.net/bugs/121833
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