I have an ASUS X55A-SPD0204O laptop. The rest of the FN+Fx (where x = number) like sound + - mute, screen turn off, wireless etc. work perfectly.
The problem is with the 2 brightness keys. They just won't work. Any suggestions?
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acpi_backlight=vendor as a boot option. To do that, open a terminal window, and run
gksu gedit /etc/default/grub
Locate this line:
Edit it to look like this:
Save the file, then, in a terminal, run
Reboot, and check if the brightness keys work.
You can try to control it from command line and give mesage back if this works in general:
You will need
xrandr --current --verbose - this will display your current display mode / modes
important is name of your output (clould be
xrandr --output <outputname> --brightness 0.5 - this should control your brightnes, you can try different values. Do not use zero (0) what means lamp is switched off and you will see Big nothing.
be careful, some types of devices have completely different set of values (as 0-255, etc. Unfortunatelly I do not have your ASUS to test it)
This will work probably independently of the brightness settings reachable normally via keys. If this works, I recommend to watch for key bindings. Advantage is, you can control brightness of external VGA output as well.
Upgrade the grub and try you may be able to get the brightness working properly. You may follow this link and to upgrade and fix the brightness problem for your PC.
try that .. i had your same problem and it work with me
Open a terminal window and type the following:
sudo nano /etc/X11/xorg.conf
This will open your X server configuration (after prompting for your password). You should see a section titled "Device" that looks as follows:
Section "Device" Identifier "Default Device" Driver "nvidia" Option "NoLogo" "True" EndSection
Append a line so it appears like this:
Section "Device" Identifier "Default Device" Driver "nvidia" Option "NoLogo" "True" Option "RegistryDwords" "EnableBrightnessControl=1" EndSection
You will need to restart your graphical server (or reboot) for this change to take effect.
PS: I tried all suggested solutions here and nothing worked with me!
it seems like there are 2 solutions for this problem, but sometimes none of these work. I tried changing the boot options (editing-updating grub and stuff) and that didn't work. As I have seen in many forums (and in my case too), the change in the xorg.conf file won't work because there is no such file... so?
After searching a couple hours, I found something interesting:
sudo nvidia-xconfig sudo reboot
those lines supposedly get the driver working as it should, but the original problem remains. The important thing is that those lines CREATE the xorg.conf file, so now it is possible to apply the second solution (adding the
Option "RegistryDwords" "EnableBrightnessControl=1" line to the file).
Hope this helps someone, I used this on a Samsung R580, with a Nvidia GeForce310m and worked just fine.
By the way, I used
sudo gedit /etc/X11/xorg.conf instead of the
nano command, it's just a matter of tastes I guess...
Try this app .. for problem in brightness controlling. Use the following commands
sudo add-apt-repository ppa:apandada1/brightness-controller sudo apt-get update sudo apt-get install brightness-controller
I was also searching stuff related to driver , but at last I found this app . I am having ubuntu - 12.04 on Sony - vaio, working fine for me.