====== Dual Monitors ====== Known to work on Slackware 14.1 and XFCE If you are running XFCE and your secondary monitor isn't working, check and make sure it's enabled in XFCE's SETTINGS: SETTINGS > SETTING MANAGER > DISPLAY > display name in column on left > USE THIS OUTPUT ====== Mirror Monitors ====== By default, XFCE (the WM I use) seems to do this by default. ====== Extend Desktop To Second Monitor ====== To extend the desktop to a second monitor (as opposed to mirror the desktop), you need to use xrandr to move the desk top over X number of pixels. Where X = your LEFT monitor's X resolution. 1) Make sure your video card's output is being 'seen' by the system and get the output names: xrandr -q ( Make note of the name of your secondary monitor. ) 2) Move the secondary monitor over to the right xrandr --output HDMI-0 --pos 1024x0 # to move the VGA screen 1024 pixels to the right. EXAMPLE: Here's my machine. DVI-I-2 is my LEFT monitor and HDMI-0 is my RIGHT monitor. [arfon@darkstar ~]$ xrandr -q Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384 DVI-I-0 disconnected (normal left inverted right x axis y axis) DVI-I-1 disconnected (normal left inverted right x axis y axis) DVI-I-2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 598mm x 336mm 1920x1080 60.0*+ 1680x1050 60.0 1440x900 59.9 1280x1024 75.0 60.0 1280x960 60.0 1280x800 59.8 1280x720 60.0 1152x864 75.0 1024x768 75.0 70.1 60.0 800x600 75.0 72.2 60.3 56.2 640x480 75.0 72.8 59.9 HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 521mm x 293mm 1920x1080 60.0*+ 59.9 60.1 60.0 1440x480 60.1 1280x720 60.0 59.9 1024x768 75.0 70.1 60.0 800x600 75.0 60.3 720x480 59.9 60.1 640x480 75.0 59.9 59.9 DVI-I-3 disconnected (normal left inverted right x axis y axis) [arfon@darkstar ~]$ xrandr --output HDMI-0 --pos 1920x0 ====== Cool Switching Scripts ====== Here's a script I wrote to toggle between extended dual monitors and a single monitor- #!/bin/bash vPRIMARYMONITOR="DVI-I-0" # <--- CHANGE THIS. Find using "xrandr -q" vLOC="--right" # <--- Change this if you want the second monitor in another position. CHOICES: --above --below --left --right vEXT=$(xrandr -q | grep " connected" | grep -v $vPRIMARYMONITOR | awk '{print $1}' | head -n 1 ) vOnOff=$(xrandr -q | grep $vEXT | sed 's/primary//g' | awk '{print $3}'| sed 's/[0-9]*x[0-9]*+[0-9]*+[0-9]*/ON/g' ) [ "$vOnOff" != "ON" ] && vOnOff="OFF" if [ "$vOnOff" = "OFF" ]; then /usr/bin/xrandr --output $vEXT --auto $vLOC $vPRIMARYMONITOR else /usr/bin/xrandr --output $vEXT --off fi Script to toggle a mirrored monitor- #!/bin/bash vPRIMARYMONITOR="DVI-I-0" # <--- CHANGE THIS. Find using "xrandr -q" vEXT=$(xrandr -q | grep " connected" | grep -v $vPRIMARYMONITOR | awk '{print $1}' | head -n 1 ) vOnOff=$(xrandr -q | grep $vEXT | sed 's/primary//g' | awk '{print $3}'| sed 's/[0-9]*x[0-9]*+[0-9]*+[0-9]*/ON/g' ) [ "$vOnOff" != "ON" ] && vOnOff="OFF" if [ "$vOnOff" = "OFF" ]; then /usr/bin/xrandr --output $vEXT --auto else /usr/bin/xrandr --output $vEXT --off fi ====== Sources ====== * Originally written by [[wiki:user:arfon | arfon]] {{tag>howtos software window_managers dual_monitors monitors dual_displays displays author_arfon}}