Brightness settings not working on Aspire E1-571G

When I try to adjust the brightness bar in 'Brightness & Lock' in system settings. There is absolutely no change.

Is there some other way that I can configure my screen brightness other than in Brightness and Lock setting?

1 Answer

Edit the file /etc/default/grub

Change the line: GRUB_CMDLINE_LINUX=""

to

GRUB_CMDLINE_LINUX="quiet splash acpi_osi=Linux acpi_backlight=vendor"

and then save and then run: sudo update-grub

Then restart the computer, then it should work.