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I'm trying to control the brightness of my notebook's screen using NVIDIA X Server but the changes only persist for a few seconds, then turns back to the default settings.

**I've already tried all i've found on the internet about this problem (xorg.conf, grub).

Also have tried changing the brightness from the terminal but it doesn't even recognize the device.

$ sudo setpci -s 00:02.0 F4.B=20
setpci: Warning: No devices selected for "F4.B=20".

This is very frustrating because my battery doesn't last as long as it does on windows.

My notebook is a Toshiba Satellite L750 with Geforce GT550.

$ lspci | grep nV
01:00.0 VGA compatible controller: nVidia Corporation Device 0dec (rev a1)
01:00.1 Audio device: nVidia Corporation GF108 High Definition Audio Controller (rev a1)
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up vote 0 down vote accepted

This solved the problem on a vaio laptop with nvidia card

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Thanks a billion! It worked. – flowerpower Dec 31 '11 at 10:55

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