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I have installed Ubuntu 14.04 on my ASUS X555L Laptop using an nVidia GeForce 520M Graphics card. The fn+f5/f6 keys are unable to adjust brightness. Currently my screen brightness level is maximum. My grub file looks like this :

GRUB_DEFAULT=0
GRUB_HIDDEN_TIMEOUT=0 
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
GRUB_CMDLINE_LINUX=""

Also I tried installing XBacklight but that doesn't fix this problem .

I will be highly grateful if someone could help me with this...

Fabby
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chatzz
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1 Answers1

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For ASUS laptops the string must be

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="

Then run sudo update-grub.

This will create events for Fn buttons.

Pilot6
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