Keywords: Brightness Control, Ubuntu ,Linuxmint
My colleague was having issue with his HP laptop. He was not able to control the brightness of his laptop using function keys. Here are the steps to enable brightness control using function keys in Ubuntu and Linuxmint. To do that we need to edit GRUB configuration file.
Below method has been tested with Ubuntu 12.04, Ubuntu 14.04 and Linuxmint 17 and Linuxmint 17.01. I hope this will work with other Linux distributions also.
Step: 1 Open a terminal and type following command and enter.
$ sudo gedit /etc/default/grub
After enter it will ask for your pass-word.
Step: 2 Enter your account password. Please note that when you type your password it won’t be visible to you, so don’t get confuse. Just enter your password care-fully.
It will open the GRUB configuration file. See below screen shot attached.
Step: 3 In this file we need to edit the line GRUB_CMDLINE_LINUX=”” to GRUB_CMDLINE_LINUX=”acpi_backlight=vendor”. After that save the file.
Step: 4 Now you have to update the GRUB configuration file. Enter the following command in the terminal
$ sudo update-grub
You will see output something like below attached screen-shot. That’s all.
Step: 6 Restart your system and now you will be able to control brightness any time.
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