Linux: Use VNC to create a second Screen

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1

I'm planning to use my 7" Android tablet as second screen via VNC.

Sharing my main screen works fine with x11vnc, but that is not what I want.

So I created a second screen using the xorg86-video-dummy driver and share this screen with x11vnc -display :1 which works but I don't get it managed to use xrandr "extending" this screen with the main screen... .

What am I doing wrong or is there a better solution? The driver for the main screen is the cs nvidia one.

Guido Krömer

Posted 2011-07-03T13:21:20.593

Reputation: 221

1Can you try to clear up a few ambiguities for me? Where are you creating this second screen? I don't understand what you mean by "which works but I don't get it ma[n]aged to use xrandr 'extending' this screen with main screen" either. If you could clarify your question, I think you'd have a better chance at getting a good response. – Jeff Welling – 2011-07-03T17:02:17.247

Okey, here is the important part of my second xorg.conf: ` Section "ServerLayout" Identifier "Layout" Screen 0 "ScreenVNC" 0 0 EndSection

Section "Monitor"... EndSection

Section "Screen" Identifier "ScreenVNC" Device "DeviceVNC" Monitor "MonitorVNC" DefaultDepth 24 SubSection "Display" Depth 24 Modes "800x480" EndSubSection EndSection

Section "Device" Identifier "DeviceVNC" Driver "dummy" EndSection `

I can share this Screen with x11vnc but I want to use this screen... – Guido Krömer – 2011-07-04T20:46:42.997

As second screen by extendig it with xrandr ore something like this... – Guido Krömer – 2011-07-04T20:52:02.400

Your setup looks quite interesting. Can you provide your xorg.conf.dummy files? Thx, yanosz – None – 2013-03-02T17:23:58.340

ockquote>

but I don't get it mamaged to use xrandr "extending" this screen What did you try? What happenned when you tried it? What does xrandr --auto show?

– symcbean – 2011-07-04T12:35:07.770

user@Thinkpad-T61>xrandr --screen 1 xrandr: Failed to get size of gamma for output default Screen 1: minimum 320 x 240, current 1024 x 768, maximum 1024 x 768 default connected 1024x768+0+0 0mm x 0mm 1024x768 60.0* 800x600 60.0 56.0 640x480 60.0 512x384 60.0 400x300 60.0 56.0 320x240 60.0 – Guido Krömer – 2011-07-04T20:39:34.190

caco@Thinkpad-T61>xrandr --screen 0 xrandr: Failed to get size of gamma for output default Screen 0: minimum 320 x 175, current 1440 x 900, maximum 1440 x 900 default connected 1440x900+0+0 0mm x 0mm 1440x900 50.0* 51.0 52.0 1024x768 53.0 54.0 55.0 56.0 57.0 ... – Guido Krömer – 2011-07-04T20:40:08.790

But i can't set something like "xrandr --output VGA-0 --left-of LVDS" or in my case somethig like this "xrandr --output --Screen-1 --left-of -Screen-0"(If something is possible with Xrandr...) – Guido Krömer – 2011-07-04T20:44:37.057

Answers

4

I think I have found a solution using xdmx instead of xrandr; I will try this on a virtual machine running two xservers (with dummy devices) plus xdmx as primary xserver.

My first try with two "dummy xservers":

Xorg :2 -config /etc/X11/xorg.conf.dummy & // my "real screen"
Xorg :3 -config /etc/X11/xorg.conf.dummy & // my "vnc screen"
Xdmx :4 +xinerama -display localhost:2 -display localhost:3 &
x11vnc -display :3 -noshm

Works, but now I have to tell slim to work with xserver number 4 and put this all together into a failsafe bash script.

Guido Krömer

Posted 2011-07-03T13:21:20.593

Reputation: 221

Asked: 2011-07-03T13:21:20.593

Viewed: 9 343 times

Active: 2013-07-13T17:59:28.253