Hello, thanks for your report!

Due to your link, i have testet die "acpi_osi= " parameter again and
against my first description (i was able to adjust die brightness via fn
keys once a time #9) the brightness stand still on 100%, but the
difference to other parameters is that the notification daemon show me
the reaction.

The problem is may a clash between backlight providers ...
https://bugs.freedesktop.org/show_bug.cgi?id=81762 (Comment 6).

Here i found more information about two patches
https://bugzilla.kernel.org/show_bug.cgi?id=70241 (Comment 94,92).


But it seems there is no proper solution for me so far ... :(


Regards,

patrice

** Bug watch added: freedesktop.org Bugzilla #81762
   https://bugs.freedesktop.org/show_bug.cgi?id=81762

** Bug watch added: Linux Kernel Bug Tracker #70241
   http://bugzilla.kernel.org/show_bug.cgi?id=70241

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https://bugs.launchpad.net/bugs/1263498

Title:
  Asus G75VX, can not modify brightness

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