Brightness control button is changing brightness value in file /sys/class/backlight/acpi_video0/brightness
, but screen brightness is not changing.
2 Answers
I think this app will work for you :) https://apps.ubuntu.com/cat/applications/trusty/brightness-controller/
Try this:
On your terminal:
> gksudo gedit /etc/default/grub Locate: GRUB_CMDLINE_LINUX="" Change to: GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor" Then again in your terminal: > sudo update-grub
Reboot Computer. Now it should work !
Proven on my Packard Bell TS11HR Laptop !