Hello, i could solve the problem on my own through trial and error. I
just started to remove the packages which are related to brightness and
completely removed "acpid", "acpi-support", "laptop-mode-tools", "xfce4
-power-manager" and "xfce4-power-manager-plugins" packages, then
installed back all of them step by step, between steps i rebooted my
computer and checked the status. At the end i determined the "xfce4
-power-manager" and "xfce4-power-manager-plugins" packages are
responsible for this conflict about setting the brightness. I think the
same problem does exist for gnome-power-manager too, because all of
ubuntu based distros have same problem for my computer...
** Changed in: linux (Ubuntu)
Status: Triaged => Fix Committed
** Changed in: linux (Ubuntu)
Status: Fix Committed => In Progress
** Changed in: linux (Ubuntu)
Status: In Progress => Confirmed
** Also affects: xfce4-power-manager (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/990932
Title:
Ubuntu 12.04 backlight problem of msi notebook with nvidia 8400m
graphic card
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