Ubuntu: Fn+F6 & F7 does not work for screen brightness in 12.04


I am using Toshiba Portege R835-P70 and function keys work as expected on Windows but they do not on Ubuntu 12.04. For e.g. Fn+F6 and Fn+F7 are supposed to change screen brightness but do not work.

What is the solution for this issue?

I tried adding GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash acpi_backlight=vendor“ to /etc/default/grub, but it introduces an additional problem in that the laptop wakes up to a faintly visible dark screen from hibernation.

I know this is an old issue, but if it is so common, why isn't there a simple solution to it and why isn't it incorporated in latest versions of Ubuntu?



The following edit to /etc/default/grub helped me:

sudo nano `/etc/default/grub`  

and then change the GRUB_CMDLINE_LINUX_DEFAULT to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor"   

Then run update-grub and reboot.



See a solution that worked on my Protege 705-P35 at Toshiba Portege Z830\Z835 [Linux Laptop Wiki]. To make the new script executable, type:

sudo chmod 755 /etc/pm/sleep.d/restore_brightness  


Try this:

open your terminal and type this

sudo gedit /etc/default/grub  

and find a line

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"  

and change it to like that. then close the editor and do sudo update-grub and give a restart. check it out now.

Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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