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I have a laptop with the newest Ubuntu-version (12.04). I want to use the FN-Keys to adjust the brightness of my screen, but it doesnt work. Normally it should be FN+left arrow/right arrow. However adjusting the volume with FN+ up arrow/down arrow works fine.

I already searched for a few soulutions, for example tried to replace in the Grub-File

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

with

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

or

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash cpi_osi=Linux"

but it all doesn't work for my laptop. How can I fix this problem?

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This may help you: askubuntu.com/questions/56155/… – Weylin Schreck Oct 5 '12 at 10:06
Thank you for your answer. The link you gave me looks useful, but I dont know how to do it. I installed xdotool, but it only works, if I write it in the terminal. If I want to make a new shortcut (in the system configuration) it doesnt work. Regarding the solution of sagarchalise and Michał Šrajer: i found the sys/class/blacklight/acpi_video0/brightness witht the number 15, but I dont know what to do. There is no explanation. – richter12 Oct 5 '12 at 15:52

1 Answer

up vote 1 down vote

Couldn't change graphics with Fn keys on my Acer laptop.

This helped me (notice a little bit different parameter), added to /etc/default/grub:

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

Then runupdate-grub and reboot.

Source: http://www.refreshit.info/2012/08/solved-brightness-increase-and-decrease.html

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