I am trying to to add a resolution mode for X with the xorg-dummy driver to be able to fit the x11vnc server's output to my screen resolution. I am running
x11vnc -xdummy -xrandr
with the x11vnc Xdummy script in my path. If I don't add a xorg.conf file in /etc/X11 then I get only a bunch of lower resolutions.
Therefore I added this xorg.conf file https://www.xpra.org/xorg.conf with which I also have a number of higher resolutions. Among them is 1920x1200 which I need, but rotated by 90 degrees.
Using http://www.arachnoid.com/modelines/ , I therefore computed the Modeline
Modeline "1200x1920_10.00" 27.20 1200 1192 1304 1408 1920 1921 1924 1932 -HSync +Vsync
And added it to the xorg.conf file together with the corresponding Mode. After restarting, however, I still don't have this mode. In my /var/log/Xorg.log I see thigs like
Not using mode "1200x1920" (no mode of this name)
but also
Not using mode "1920x1200" (no mode of this name)
The later works in fact. The former does not. I also tried adding it with xrandr, but I get
Failed to get size of gamma for output default
Furthermore I tried supplying the mode using the argument -geom 1200x1920 to the Xdummy script. This does not add the resolution either.
Does xorg-dummy only support the modes already specified in the sample xorg.conf or am I making a mistake? The goal of of the exercise is to be able to switch the vnc-server resolution dynamically. I could use other vnc-servers but most of these seem to have issues related to the use of KDE. KDE's own krfb is unfortunately much slower.
xpra
. Sorry for not being able to help.