[Solved] Brightness Increase and Decrease Problem in Ubuntu-using grub Update

Brightness problem in Ubuntu is one of the major problem in many PCs and I have the same problem in my laptop Acer Aspire 3830 TG in Ubuntu 12.10 Quantal Quetzal. When I use the function key and brightness button the indicator of brightness changes but there will be no change of brightness.
I searched in the web and found the many solutions but not working exactly for the problem. Before in my blog post I had given the solution for the brightness problem but I only changes the contrast. The battery power consumption is same if the display is more or less.

I have tried by updating the Kernel to the latest version. But I have found the best solution that can increase or decrease the brightness of the PC in Ubuntu using the function and brightness button. Just follow the steps:

Open terminal (Clt+Alt+T)  and run the command given below:

sudo gedit /etc/default/grub

Now the new window opens and you will see the lines given below:

 GRUB_CMDLINE_LINUX_DEFAULT="quite_splice"

GRUB_CMDLINE_LINUX_DEFAULT="" 

Now you have to change the lines above by the command lines given below:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor"

Then save the window and Update the grub from the terminal using :

sudo update-grub

Now you can Increase or decrease the brightness of your PC in Ubuntu 12.04 and the other versions also. This technique can be used in HP DV6, Acer Aspire, Dell Inspiron,  Toshiba and more others.

                        Hope this Helps!
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