[SOLVED] Setting LCD brightness in terminal

tasty_minerals · 2011-10-11 21:12:23

I'm trying to set LCD brightness in script. But unfortunately the desired command do not work.
I've grepped my VGA card number

01:05.0 VGA compatible controller: ATI Technologies Inc RS780M/RS780MN [Radeon HD 3200 Graphics]

"setpci -s 01:05.0 F4.B=F0" do not change the brightness whatever value I use.
My pc is a thinkpad laptop. If there is any workaround?

Last edited by tasty_minerals (2011-10-12 20:13:37)

roygbiv · 2011-10-11 21:25:07

try using xbacklight or echo [0-24] > /sys/class/backlight/acpi_video0/brightness as root

tasty_minerals · 2011-10-11 21:34:21

"echo [0-15] > /sys/class/backlight/acpi_video0/brightness" works.
Thank you

tasty_minerals · 2011-10-11 22:03:39

Now could somebody help me a little bit with the script.
Bumped here
sudo echo 8 > /sys/class/backlight/acpi_video0/brightness :Permission denied
I understand that first time sudo is invoked only for echo command, how can I make it actually run the whole chain?

roygbiv · 2011-10-12 14:46:26

I used this script binded with two keys:

#!/bin/bash

file="/sys/class/backlight/acpi_video0/brightness"
level=$(cat $file)

if [[ "$#" -eq 0 ]]; then
    cat $file
elif [[ "$1" = "-" ]]; then
    echo $(( level - 1 )) > $file
elif [[ "$1" = "+" ]]; then
    echo $(( level + 1 )) > $file
fi

By adding the location of the script to root's $PATH, i.e $HOME/myscripts, it can be run with sudo. It accepts '+' and '-', but it can easily be changed to handle brightness [0-24] values I guess.

Last edited by roygbiv (2011-10-12 14:47:38)

tasty_minerals · 2011-10-12 20:13:26

roygbiv wrote:

I used this script binded with two keys:
#!/bin/bash

file="/sys/class/backlight/acpi_video0/brightness"
level=$(cat $file)

if [[ "$#" -eq 0 ]]; then
    cat $file
elif [[ "$1" = "-" ]]; then
    echo $(( level - 1 )) > $file
elif [[ "$1" = "+" ]]; then
    echo $(( level + 1 )) > $file
fi
By adding the location of the script to root's $PATH, i.e $HOME/myscripts, it can be run with sudo. It accepts '+' and '-', but it can easily be changed to handle brightness [0-24] values I guess.

thanks again, will try it out

Arch Linux

#1 2011-10-11 21:12:23

[SOLVED] Setting LCD brightness in terminal

#2 2011-10-11 21:25:07

Re: [SOLVED] Setting LCD brightness in terminal

#3 2011-10-11 21:34:21

Re: [SOLVED] Setting LCD brightness in terminal

#4 2011-10-11 22:03:39

Re: [SOLVED] Setting LCD brightness in terminal

#5 2011-10-12 14:46:26

Re: [SOLVED] Setting LCD brightness in terminal

#6 2011-10-12 20:13:26

Re: [SOLVED] Setting LCD brightness in terminal

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