For presentations I want to use the external USB connected video adapter connected to the projector (especially as the standard VGA output in my laptop got damaged).My idea was to start a dedicated X server on this additional video adapter,and make it available via VNC.Then I can connect to it with xvncviewer to manage the presentation from my main X session (and have additional applications open, which are not visible for the audience).Hover the problem is, that if I start the X server in this additional video adapter, it uses certain virtual console.As soon as I switch the virtual console to return to my main X session (to access the presentation X server via VNC), the presentation X server stops refreshing (as it sees, that its virtual console is not active).Is there any way to start the additional X server in such a way, that it keeps refreshing, when I'm working in my main X session?
How to have X server on another graphics card which keeps refreshing when I'm working on my main display?
usb;display;x server
Sorry for answering my own question, but as no other responses were published, I've decided to do it.It seems, that I have found a working solution:I start the X server with the -sharevts flag: X -config displaylink.conf -sharevts  :2I start my applications:DISPLAY=2:  x-window-manager   DISPLAY=2:  xtermI start the vnc server:x11vnc -localhost -display :2The displaylink.conf has the following contents:Section Device  Identifier      dl1  driver          fbdev  Option  fbdev /dev/fb1EndSectionSection InputDevice   Identifier      Generic Keyboard   Driver          void   Option          CoreKeyboardEndSectionSection InputDevice   Identifier      Configured Mouse   Driver          void   Option          CorePointerEndSectionSection Monitor   Identifier monitor0 EndSectionSection Screen  Identifier screen0  Device dl1  Monitor monitor0  DefaultDepth 16EndSectionSection ServerLayout  Identifier     external  Screen  screen0   InputDevice Generic Keyboard CoreKeyboard  InputDevice Configured Mouse CorePointer      Option AutoAddDevices OffEndSectionSpecial case - additional display bigger than the mainLast time I have faced a situation, where the projector used for presentation had higher resolution than my laptop. It resulted in necessity to scroll presentation screen to access menu or toolbar, which was very inconvenient during a lecture.After some unsuccessful attempts to force the projector to use one of lower resolutions acceptable for the LCD screen of my laptop, I have found, that I can use the -scale option in x11vnc. So the 3rd point above should look as follows:I start the vnc server:x11vnc -localhost -scale 1024x768 -display :2  The solution is not perfect, as the desktop image is a little blurred (on the laptop, not on the screen), but I can easily navigate through my presentation and demo applications.