My Samsung P35 laptop worked good with Ubuntu Feisty 7.04.

Now I've upgraded my working Ubuntu to the recently published Ubuntu
7.10. In a few seconds after log in my laptop stops to react to
Fn+LightUp Fn-LightDown key combinations. Even worse: the screen starts
to flicker badly several minutes. I see instantly the backlight
adjustment mini-window.

cat /proc/acpi/video/VGA/LCD/brightness
<not supported>

Laptop became almost unusable, flickering makes me crazy.

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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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