[Libvncserver-common] Simulating X monitor in x11vnc

[Tomasz M. <li...@ex...>]

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Hello,

Short summary: is it possible to simulate an X monitor in x11vnc, that
would be visible to desktop environment as monitor?

Long version:

I've got a Linux Thinkpad X61 notebook, which has a small screen
(1024x768) and one VGA output. At work I've got another Windows PC with
two big screens (both 1920x1080). Sometimes I need to work on my
notebook, and being able to use PC's screens would be wonderful. I
connected one of them using a standard VGA cable.

I thought that I could use VNC to use another screen: launch a VNC
client on the Windows PC and somehow use it to extend a standard X
session. So I firstly extended my virtual screen space:

    xrandr --fb 4864x1080

and then used x11vnc to act as server for VNC:

    x11vnc -clip 1920x1080+2944+0

Now I've got something that looks as if the second big screen was
connected directly to my notebook. E.g. I can drag windows from directly
connected monitors to the VNC-relayed one, and the performance is good
enough (there's 1Gbps connection between PC and notebook).

However, it seems that my GNOME does not know that the screen space
which is relayed over VNC is displayed. I cannot maximize windows on
that monitor, nor can I put gnome panels there. Nautilus does not show
its icons there, and no background image is displayed. I assume this is
because both the internal screen and the VGA-connected one are handled
as hardware monitors, and the x11vnc one not (output from xrandr):

#v+
Screen 0: minimum 320 x 200, current 4864 x 1080, maximum 8192 x 8192
LVDS1 connected 1024x768+0+312 (normal left inverted right x axis y
axis) 246mm x 184mm
[...]
VGA1 connected 1920x1080+1024+0 (normal left inverted right x axis y
axis) 521mm x 293mm
[...]
#v-

Question: how to tell X server that this space is being displayed on
x11vnc? I did a little of Xlib coding in the past, so I could try a
little hacking--but in this case I don't even know where to start.

Thanks,

Tomasz Melcer
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