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Xbacklight

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questlinq
Posts: 69
Joined: 2017-09-19 08:51

Xbacklight

#1 Post by questlinq »

Hello,

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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Head_on_a_Stick
Posts: 14114
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Location: London, England
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Re: Xbacklight

#2 Post by Head_on_a_Stick »

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
deadbang

questlinq
Posts: 69
Joined: 2017-09-19 08:51

Re: Xbacklight

#3 Post by questlinq »

@Head_on_a_Stick

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

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debiman
Posts: 3063
Joined: 2013-03-12 07:18

Re: Xbacklight

#4 Post by debiman »

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

but...

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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