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Old 02-13-10, 06:36 AM   #31
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Join Date: Jan 2010
Posts: 21
Default Re: Linux backlight driver

When you execute
cat /sys/class/backlight/nvidia_backlight/brightness
what number is returned?

What distribution do you use? Perhaps you don't have sudo installed, so you need this command instead
su -c "echo 50 | tee -a /sys/class/backlight/nvidia_backlight/brightness"
You can also test the brightness with the following command. Run it as normal user, not root.
dbus-send --print-reply --system --dest=org.freedesktop.Hal  /org/freedesktop/Hal/devices/computer_backlight org.freedesktop.Hal.Device.LaptopPanel.SetBrightness  int32:50
P.S. You can try lower values than 50
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