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| #!/bin/bash | |
| # https://github.com/dianariyanto/virtual-display-linux/ | |
| # https://bbs.archlinux.org/viewtopic.php?id=180904 | |
| # https://unix.stackexchange.com/questions/378373/add-virtual-output-to-xorg | |
| set -euo pipefail | |
| set -x | |
| resolution="1920x1080" | |
| screen="HDMI-2" | |
| echo "Configuring monitor $screen to $resolution" | |
| if ! ( xrandr | grep -Pzo ".*$screen'.*\n(\s+.*\n)+" | grep -E "\s$resolution\s" ); then | |
| if ! ( xrandr | grep -E "\s$resolution\s" ); then | |
| xrandr --newmode $resolution $(cvt ${resolution/x/ } 60.02 | grep "^Modeline" | sed -E 's/Modeline\s+"[^"]+"\s+//') | |
| fi | |
| xrandr --addmode $screen $resolution | |
| fi | |
| xrandr --output $screen --mode $resolution --right-of eDP-1 | |
| echo "started display $screen to $resolution" | |
| trap "xrandr --output $screen --off &" 0 1 3 6 14 15 | |
| killall /usr/bin/x0vncserver || true | |
| echo "starting x0vncserver" | |
| x0vncserver \ | |
| -rfbauth ~/.vnc/passwd \ | |
| -AcceptKeyEvents=off -AcceptPointerEvents=off -AcceptSetDesktopSize=off \ | |
| -Geometry=$resolution+1920+0 \ | |
| # -FrameRate 15 \ | |
| xrandr --output $screen --off |
I tried using this script, on Debian 11 and setting the right options. On my end what it does is flash my screen twice, add an xrandr mode to a disconnected port and creating a ghost VNC server nobody can connect to (only after changing the x0vncserver call).
Output, before x0vncserver call is changed:
+ resolution=1920x1080
+ screen=HDMI-2
+ echo 'Configuring monitor HDMI-2 to 1920x1080'
Configuring monitor HDMI-2 to 1920x1080
+ xrandr
+ grep -Pzo '.*HDMI-2'\''.*\n(\s+.*\n)+'
+ grep -E '\s1920x1080\s'
+ xrandr
+ grep -E '\s1920x1080\s'
1920x1080 60.02*+ 60.01 59.97 59.96 59.93
1920x1080 60.02
+ xrandr --addmode HDMI-2 1920x1080
+ xrandr --output HDMI-2 --mode 1920x1080 --right-of eDP-1
+ echo 'started display HDMI-2 to 1920x1080'
started display HDMI-2 to 1920x1080
+ trap 'xrandr --output HDMI-2 --off &' 0 1 3 6 14 15
+ killall x0vncserver
x0vncserver: nessun processo trovato
+ true
+ echo 'starting x0vncserver'
starting x0vncserver
+ x0vncserver -rfbauth /home/sergio/.vnc/passwd -AcceptKeyEvents=off -AcceptPointerEvents=off -AcceptSetDesktopSize=off -Geometry=1920x1080+1920+0
x0vncserver: Option -AcceptKeyEvents: Option AcceptKeyEvents can only be set to true or false!
x0vncserver usage:
Help can be found in x0vncserver(1), or via usage of
-help if specified, dumps this help message.
-h is an alias for help.
-? is a***the entirity of the arguments list***
+ xrandr --output HDMI-2 --off
what it does is flash my screen twice
That's probably xrandr --output HDMI-2 --mode 1920x1080 --right-of eDP-1 and xrandr --output HDMI-2 --mode 1920x1080 --right-of eDP-1, turning the second monitor on and off.
x0vncserver: Option -AcceptKeyEvents: Option AcceptKeyEvents can only be set to true or false!
Looks like on Debian you need to replace off with false, on arch it accepts many variants.
Output, before x0vncserver call is changed:
What is the output afterwards?
What is the output afterwards?
Exactly the same until starting x0vncserver
+ x0vncserver -rfbauth /home/sergio/.vnc/passwd -AcceptKeyEvents=false -AcceptPointerEvents=false -AcceptSetDesktopSize=false -Geometry=1920x1080+1920+0
New X0tigervnc server 'debian:0 (sergio)' on port 5900 for display :0.
Use xtigervncviewer -SecurityTypes VncAuth -passwd /home/sergio/.vnc/passwd :0 to connect to the VNC server.
+ xrandr --output HDMI-2 --off
+ xrandr --output HDMI-2 --off
Connecting via a secondary device will give a time out.
Connecting locally will give a
CConn: unable to connect to socket: Connessione rifiutata (111)
I added --localhost no to the tigervnc arguments and this got the VNC server to be visible, but the client will be immediately stopped as soon as an external device or the same device will try to connect to it with a CConn: End of stream.
Every other attempt to connect from any device will fail with the same error listed in the message before (the server died?).
Removing +1920+0 from line 19 fixes the VNC server from crashing (but of course, it is just a mirror of the main screen). The X server is not drawing anything at all over the bounds of the main screen, as the system is still seeing only 1 screen.
Mmh. Seems it doesn't work for you. What does your vnc client display if you remove the geometry from the commandline when the virtual display is active?
Mmh. Seems it doesn't work for you. What does your vnc client display if you remove the geometry from the commandline when the virtual display is active?
My main screen only.
The problem is the virtual screen is never active. I never see it appear in my XFCE4 screen settings, nor can I move past my main screen boundaries.
It will appear as disconnected in xrandr but with an available video mode.
I never see it appear in my XFCE4 screen settings
I use cinnamon, but it won't appear in its display settings either. I can move windows over to the virtual monitor though, and in arandr (like a gui for xrandr).
Maybe XFCE does some things different so it won't work. You maybe need a dummy HDMI plug
In Line 15 you need to replace the frame rate and in line 19 the name of your actual monitor