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Cannot change screen brightness in ubuntu

Brightness ubuntu

Cannot change screen brightness in Ubuntu

I just reconfigured Ubuntu 14.4 in my Latitude 3540 model laptop, ran software update to latest patches available for Ubuntu 14, for wifi I just installed from additional hardware searching for available wireless adapter. everything seems to be working fine,

except brightness control by keyboard shortcut… I was stuck there and could get a solution after some research.

Open a terminal (Ctrl + Alt + T).

$ sudo nano /etc/default/grub 

Will edit the grub file here

Around the 11th line, find something like: GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash”.
Change it to GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash acpi_backlight=vendor”

Save the file by Ctrl+O followed by Ctrl+X.

Then run in terminal

$ sudo update-grub

Reboot the machine

$ sudo shutdown -r now

now you can see brightness control through keyboard is working now.

Hope it helps.

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