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Postby questlinq » 2017-12-03 17:10


I'm trying to set screen brightness in terminal using
Code: Select all
xbacklight -set 15
and I get the following error 'No outputs have backlight property'.

If I'm not mistaken I believe 'xorg.conf' file must be created in /etc/X11 .. My question is what data from
Code: Select all
xrandr --verbose
output to be put in xorg.conf file, if I'm using AMD driver?
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Re: Xbacklight

Postby Head_on_a_Stick » 2017-12-03 17:41

I don't think an xorg.conf will make `xbacklight` work (but I may be wrong).

However, I do know that my AMD laptop (with the free radeon drivers) allows for keyboard backlight control if xfce4-power-manager is installed and running; the GNOME desktop also supports the backlight keys without needing that program.

Alternatively, you could try fiddling with the kernel parameters to see if that helps:

https://wiki.archlinux.org/index.php/Ba ... ne_options
"Le mieux est l'ennemi du bien." — Voltaire, Dictionnaire Philosophique.
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Re: Xbacklight

Postby questlinq » 2017-12-03 18:39


Unfortunately, none of your suggestions worked for me - Thank you for your effort.
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Re: Xbacklight

Postby debiman » 2017-12-05 06:30

"nothing worked" is not a valid statement on a technical forum.


if X isn't running, xbacklight won't work. simple.

apart from that, i read multiple statements (and my own experience) that xbacklight simply doesn't work.
try compiling https://github.com/haikarainen/light - it's easy, and has worked on my system, where xbacklight failed.
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