how do i set the Fn command shorcuts, screen brightness does not work

pamir · 2018-10-15 19:10:50

i have to manually set the display brightness using the touchpad on the power icon.

I want to use Fn and F5 for dimming and Fn and F6 for brighter, as it is printed on the keyboard.

thank you

damo · 2018-10-15 21:22:03

Here is a script to send brightness +/- to an xrandr command, which replicates the functionality you need...

#!/bin/bash
##
## brightness

BRIGHTNESS="$HOME/.config/mon-brightness.rc"

if [[ -f $BRIGHTNESS ]];then
    VAL=$(<$BRIGHTNESS)
else
    VAL=1.0
    echo $VAL > $BRIGHTNESS
fi

if [[ $1 = plus ]];then
    VAL=$(awk -v "VAL=$VAL" 'BEGIN { print VAL + 0.1 }')
elif [[ $1 = minus ]];then
    VAL=$(awk -v "VAL=$VAL" 'BEGIN { print VAL - 0.1 }')
else
    notify-send -t 3000 "Use 'brightness plus/minus'"
    exit 1
fi

echo $VAL > $BRIGHTNESS

xrandr --output DVI-D-0 --brightness $VAL --output HDMI-0 --brightness $VAL

NB: There is no error checking in this script, so make sure to create "$HOME/.config/mon-brightness.rc" first. You would also need to set the --output to whatever your system has (the script is for 2 monitors)

IIRC I used keybinds like Control+F9 to send the command "brightness +" to increase the value, and Control+F8 for "brightness -", because that corresponded to my laptop keys. (No need to use the Fn key)

Last edited by damo (2018-10-15 21:25:03)

damo · 2018-10-16 09:01:51

^ This assumes that you cannot map 'XF86BrightnessAdjust' to use those keys. Use xev to see what the keys are mapped to now.

At the time I made that script, the combination of hardware and kernel meant that the brightness keys didn't work in combination with the Fn key.

#1 2018-10-15 19:10:50

how do i set the Fn command shorcuts, screen brightness does not work

#2 2018-10-15 21:22:03

Re: how do i set the Fn command shorcuts, screen brightness does not work

#3 2018-10-16 09:01:51

Re: how do i set the Fn command shorcuts, screen brightness does not work

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