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First, bring up the text editor and I'll show you how to add the right contents to this file for your graphics card.

Kod: Zaznacz cały

gksu gedit /usr/share/X11/xorg.conf.d/20-nvidia.conf

If your file is empty as mine was then open up the app "NVIDIA X Server Settings" from Unity.

Then go to the "X Server Display Configuration" section.

At the bottom of the screen click the button "Save to X Configuration". We don't want to actually save anything here, but click on the "Show Preview" button.

Scroll through until you see Section "Device" and the following EndSection. Highlight and copy the entire section. Mine looked like this:

Kod: Zaznacz cały

Section "Device"
   Identifier     "Device0"
   Driver         "nvidia"
   VendorName     "NVIDIA Corporation"
   BoardName      "NVS 5400M"
EndSection

Paste this into the

Kod: Zaznacz cały

 /usr/share/X11/xorg.conf.d/20-nvidia.conf

file opened before.

Now paste the following line just before the EndSection

Kod: Zaznacz cały

Option        "RegistryDwords" "EnableBrightnessControl=1"

It should look like this:

Kod: Zaznacz cały

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "NVS 5400M"
    Option         "RegistryDwords" "EnableBrightnessControl=1"
EndSection

Now save and close

Kod: Zaznacz cały

/usr/share/X11/xorg.conf.d/20-nvidia.conf

and reboot. My brightness control now works. Got the idea from this related post

ls /sys/class/backlight

    acpi_video0

lspci -k | egrep -iA2 'vga|3d'

02:00.0 VGA compatible controller: NVIDIA Corporation GT216M [GeForce GT 330M] (rev a2)
	Subsystem: Samsung Electronics Co Ltd Device c08e
	Kernel driver in use: nvidia

lshw -C display

*-display               
       description: VGA compatible controller
       product: GT216M [GeForce GT 330M]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       version: a2
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
       configuration: driver=nvidia latency=0
       resources: irq:16 memory:dc000000-dcffffff memory:e0000000-efffffff memory:de000000-dfffffff ioport:2000(size=128) memory:dd000000-dd07ffff