Forgot to mention the flickering of the display like in the post before.

Very funny thing:

If I got to the console (STRG+ALT+F1) I can use

echo -n VALUE > /proc/acpi/video/NVID/LCD/brightness

to change the display backlight brightness (this change only affects X
if I did /etc/init.d/gdm stop before this)

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backlight brighness control does not work (Samsung Q45 with Nvidia GForce 8400M)
https://bugs.launchpad.net/bugs/146710
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