I have prepared a PPA test kernel for Ubuntu 12.04 (Precise) which
includes experimental patches that might fix these "inverted backlight
brightness" or "backlight off at startup" problems, for laptops with
Intel GPU's (despite the name of the PPA, rest assured that the
brightness control fixes are not Dell-specific):
https://launchpad.net/~kamalmostafa/+archive/dellxps
If this test kernel makes your backlight behavior better or worse,
please post your results here (reports of "no change" aren't needed).
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https://bugs.launchpad.net/bugs/842459
Title:
screen brightness is inverted
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