Arch Linux

Mikus01

Member

From: Puerto Rico

Registered: 2010-11-14

Posts: 16

Screen Brightness won't change no matter what I do

Hello guys:
For the time I've been using ArchLinux my screen brightness buttons don't work.  Also power options for adjusting screen brightness do nothing, so you see why I have a problem, my screen eats the laptop's battery... I've also tried adjusting the values of /proc/acpi/video/GFX0/DD02/brightness, but saw no effect.  I'm using an Acer Aspire 5740-5513, which has an intel core i3 using Intel Graphics Media Accelerator HD

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El_Caballero

Member

Registered: 2010-11-14

Posts: 6

Re: Screen Brightness won't change no matter what I do

Did you try with gnome-power-manager? ( Or a name like that ). You said "power options", maybe it is the same.
My Fn button does not work properly and I am using gnome-power-manager to set the brightness low.
I hope that it help.

ancient_archer

Member

From: Slovakia

Registered: 2010-03-13

Posts: 107

Re: Screen Brightness won't change no matter what I do

Hello. For the time being I cannot set my brightness automatically neither (I have a Toshiba T130-10G notebook). However, I execute this command in terminal to set the brightness:

 setpci -s 00:02.0 F4.B=30 

You can of course change that "30" value to your needs. Although being no automatic solution, I guess it will help.

Skywalker 7421

Member

Registered: 2011-02-19

Posts: 1

Re: Screen Brightness won't change no matter what I do

I faced the same issue as you Mikus01. I tried the above solution and it worked. Thanks archer!

kcirick

Member

Registered: 2010-06-21

Posts: 364

Re: Screen Brightness won't change no matter what I do

You can also use the following command to set the LCD backlight brightness:

xbacklight -set 50  

or if you want to map a key to increase/decrease the brightness:

xbacklight -inc 10
xbacklight -dec 10

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[My Arch Blog]

ViruSzZ

Member

From: The Streets

Registered: 2010-10-14

Posts: 202

Website

Re: Screen Brightness won't change no matter what I do

Hey guys, the following script I wrote might be useful for increasing/decreasing and/or setting brightness to min/max using 'xbacklight' so you can bind it to some of your key combination. For example i have FN+f2 set to '/path/to/script down' to decrease '/path/to/script up' to increase etc ...

Respect

#!/bin/bash
#
if [ $# -ne 1 ]
then
        exit 1
elif [ $1 == "down" ]
then
       xbacklight - 10
elif [ $1 == "up" ]
then
       xbacklight + 10
elif [ $1 == "max" ]
then
       xbacklight = 100
elif [ $1 == "min" ]
then
       xbacklight = 10
fi

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milomouse

Member

Registered: 2009-03-24

Posts: 940

Website

Re: Screen Brightness won't change no matter what I do

i faced the same issue with my old lenovo. the setpci command worked there too. i had written a simple script to keep track of the backlight value and change accordingly, usually through keybindings or just by command. it's written in zsh but i guess it can be changed to bash if you redo the expansions. https://github.com/milomouse/code/blob/ … /moodlight