Add a resolution to "Unknown Display"

manual_display_config.sh

#!/bin/sh

get_xorg_conf() {
	local usage="Usage: ${FUNCNAME[0]} monitor horizontal_resolution vertical_resolution refresh_rate"
	local mon=${1?$usage}
	local X=${2?$usage}
	local Y=${3?$usage}
	local refresh=${4?$usage}

	local cvt="$(cvt $X $Y $refresh)"
	local mode_line="$(echo "$cvt" | grep '^[^#]')"
	local mode_name="$(echo "$modeline" | cut -d' ' -f2)"

	# WARNING: Mixed tabs and spaces below
	cat <<-EOF
		Section "Monitor"
		    Identifier "$mon"
		    $mode_line
		    Option "PreferredMode" $mode_name
		EndSection
	EOF
}

Usage:

. <(wget -O- https://gist.githubusercontent.com/Himura2la/a3c2ba0f3664e1e60dcd15d1b1c240e1/raw)

xrandr --listactivemonitors
Monitors: 2
 0: +*LVDS-1 1366/344x768/194+0+0  LVDS-1
 1: +VGA-1 1024/271x768/203+1366+0  VGA-1

get_xorg_conf VGA-1 1280 1024 60 | sudo tee /etc/X11/xorg.conf.d/10-monitor.conf
Section "Monitor"
    Identifier "VGA-1"
    Modeline "1280x1024_60.00"  109.00  1280 1368 1496 1712  1024 1027 1034 1063 -hsync +vsync
    Option "PreferredMode" 
EndSection