Brightness control problem

[llakais]

Hey everyone,

I'm having trouble changing the brightness of my screen ever since I installed the driver for my NVIDIA card.

Basically when I use the brightness control settings on my keyboard, the little scale notifier in the upper-right-hand corner changes, but the actual screen brightness does not. Even more curiously, whenever I reboot, Ubuntu runs at the brightness that was set previous to booting, but I can't change the brightness level beyond that.

It works fine on Windows, so I don't think it's a hardware issue (I'm using 10.04).

I tried the fix described here:
http://ubuntuforums.org/showthread.php?t=1468734
but all it did was mess with the driver and screw up the graphics. I changed the grub file back and used backed up graphics settings and managed to get my graphics back under control, but no luck with the brightness setting.

Sorry to bother you guys and thanks in advance for any advice you might have.

[MyR]

I probably can't help you myself, but I can suggest posting your computer make & model as well as your graphics card make & model.

[llakais]

I probably can't help you myself, but I can suggest posting your computer make & model as well as your graphics card make & model.

Whoops.

My laptop is a Lenovo Thinkpad T410, and my graphics card is a NVIDIA NVS 3100m Graphics 256MB DDR3 with AMT.

Not sure what all that means, but hopefully it helps.

Thanks!

[maizuddin35]

does your keyboard on your laptop show something that can increase the brightness of you screen?

[warfacegod]

Lucid's Power Manager has brightness sliders in it if I'm not mistaken. Go to: System> Prefs.> Power Management

[llakais]

does your keyboard on your laptop show something that can increase the brightness of you screen?

Yes, although the buttons require the press of a function key ("Fn") to change the brightness. When I do this, the indicator shows the brightness level changing on the slider, but the actual screen brightness doesn't change.

Lucid's Power Manager has brightness sliders in it if I'm not mistaken. Go to: System> Prefs.> Power Management

Tried this too with the same result. I can set the brightness slider however I want, but that doesn't affect the brightness of the actual screen.

Thanks for the replies though, guys, I really appreciate it.

[warfacegod]

If you are by any chance using a Toshiba, getting the package fnfxd from Synaptic can help. Possibly toshutils might help as well.

Or use the Terminal:

sudo apt-get install fnfxd

sudo apt-get install toshutils

[BennBuntu]

I'm on same laptop. Brightness stopped working when I installed nvidia driver. See here. http://www.thinkwiki.org/wiki/NVIDIA_Quadro_NVS_3100M

Have to add

Option "RegistryDwords" "EnableBrightnessControl=1"

to your /etc/X11/xorg.conf under devices section. Make sure the quotation marks are the same as if you type them.

[llakais]

Have to add

Option "RegistryDwords" "EnableBrightnessControl=1"

to your /etc/X11/xorg.conf under devices section. Make sure the quotation marks are the same as if you type them.

THANK YOU THANK YOU THANK YOU!!!

This worked perfectly - such an easy fix, too. Thanks to all of you guys for all your time. It's so great that they're people willing to help like this.

[mojotexas]

Sadly, this solution did not work for me. I have edited the xorg.conf file so that it looks like this:

Section "Screen"
	Identifier	"Configured Screen Device"
	Device	"Configured Video Device"
	DefaultDepth	24
	SubSection "Display"
		Virtual	2384 768
	EndSubSection
EndSection

Section "Module"
	Load	"glx"
EndSection

Section "Device"
	Identifier	"Configured Video Device"
	Driver	"fglrx"
	Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection

Any other thoughts?