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2

After upgrading, I can no longer control the brightness of my monitor with Fn+⇐ and Fn+⇒.

I followed the instructions here - http://ubuntuforums.org/showthread.php?t=2144815 - but it still isn't working.

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Have you tried adding the kernel parameter acpi_backlight=vendor from the GRUB screen? – Smile4ever Oct 25 '14 at 17:26
    
How do you do that? – Jeremy Oct 25 '14 at 17:26
    
Restart your machine. When you get the Ubuntu boot menu (usually a black screen with some Ubuntu options), press e. Then add acpi_backlight=vendor before the quiet parameter: linux /boot/vmlinuz-linux acpi_backlight=vendor quiet splash – Smile4ever Oct 25 '14 at 17:30
    
What computer make and model were you using? (for future reference) – Wilf Feb 20 '15 at 16:11
    
@smile4ever: why 'before quiet parameter'? – philcolbourn Mar 7 '15 at 1:55
up vote 3 down vote

Open a terminal with Ctrl+Alt+T and write:

gksudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf

Type in your password, then copy-paste the following text into gedit:

Section "Device"
        Identifier  "card0"
        Driver      "intel"
        Option      "Backlight"  "intel_backlight"
        BusID       "PCI:0:2:0"
EndSection

and save again!

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Yes it solved my problem...Thx – Faisal Oct 30 '14 at 12:36
    
Can confirm that this is a working solution for Toshiba Protege Z830 running 14.10 Utopic. Thank you Sir, and plus 1 to you both. – ehime Nov 5 '14 at 21:22
2  
This did not solve the problem on my Samsung. I tried both the xorg.conf.d and the Grub approach too. Neither worked. – Rick-777 Nov 9 '14 at 21:19
    
My brightness keys only alter brightness between seemingly 2 levels: bright and slightly brighter. This did not improve for my ASUS TX201. – philcolbourn Mar 7 '15 at 1:48

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