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I'm unable to adjust my screen brightness since I installed ubuntu 13.10, it was working correctly in 11.04.

I've already set

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor" 

in /etc/default/grub, but no luck !!

Please help.

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up vote 0 down vote accepted

Try to follow the steps in another askubuntu question, that is : Ubuntu 13.10 - Brightness issue

or additionally in this page there are three steps you can follow:

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the second link, last solution !! : sudo setpci -s 00:02.0 F4.B=50 , thanks – elarichi.y Nov 13 '13 at 22:39

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