Masa's blog

_ Ctrl + Alt + plus/minus to change resolution for X Window System

I can change resolution for X Window System to use Ctrl+Alt+XK_KP_{Add|Subtract} on desktop computer. But laptop computer don't have XK_KP_something. So I try to use Ctrl+Alt+XK_{plus|minus} with fvwm to change resolution.

xrandr_plus.sh

#! /bin/sh
#
modenum_total=`xrandr |\
        egrep '^ *[0-9]*x[0-9]*' |\
        wc -l`
#
current_modenum=`xrandr |\
        egrep '^ *[0-9]*x[0-9]*' |\
        tac |\
        cat -n |\
        tr '\t' ' ' |\
        tr -s ' ' |\
        egrep '\*' |\
        cut -d ' ' -f 2`
current_modenum=`expr ${current_modenum} - 1`
#
next_modenum=`expr ${current_modenum} + 1`
next_modenum=`expr ${next_modenum} % ${modenum_total}`
#
modenum=0
for i in `xrandr |\
        egrep '^ *[0-9]*x[0-9]*' |\
        tr -s ' ' |\
        cut -d ' ' -f 2 |\
        tac`
do
        if [ ${modenum} -eq ${next_modenum} ]
        then
                modestr=$i
        fi
        modenum=`expr ${modenum} + 1`
done
#
xrandr --output "LVDS" --mode ${modestr}

xrandr_minus.sh

#! /bin/sh
#
modenum_total=`xrandr |\
        egrep '^ *[0-9]*x[0-9]*' |\
        wc -l`
#
current_modenum=`xrandr |\
        egrep '^ *[0-9]*x[0-9]*' |\
        tac |\
        cat -n |\
        tr '\t' ' ' |\
        tr -s ' ' |\
        egrep '\*' |\
        cut -d ' ' -f 2`
current_modenum=`expr ${current_modenum} - 1`
#
current_modenum=`expr ${current_modenum} + ${modenum_total}`
next_modenum=`expr ${current_modenum} - 1`
next_modenum=`expr ${next_modenum} % ${modenum_total}`
#
modenum=0
for i in `xrandr |\
        egrep '^ *[0-9]*x[0-9]*' |\
        tr -s ' ' |\
        cut -d ' ' -f 2 |\
        tac`
do
        if [ ${modenum} -eq ${next_modenum} ]
        then
                modestr=$i
        fi
        modenum=`expr ${modenum} + 1`
done
#
xrandr --output "LVDS" --mode ${modestr}

.fvwmrc

Key minus       A       CM      Exec "xrandr_minus" exec xrandr_minus.sh
Key semicolon   A       CM      Exec "xrandr_plus" exec xrandr_plus.sh