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Brightness control button is changing brightness value in file /sys/class/backlight/acpi_video0/brightness, but screen brightness is not changing.

user.dz
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mohanpb
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  • http://ubuntuhandbook.org/index.php/2014/04/save-screen-brightness-settings-in-ubuntu-14-04/ , you can try this.. – Krishna Apr 19 '15 at 07:34

2 Answers2

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I think this app will work for you :) https://apps.ubuntu.com/cat/applications/trusty/brightness-controller/

Costales
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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 !

kostandinangjellari
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