LinuxQuestions.org - Multiple X displays : Suspending AIGLX clients for VT switch

Hi everyone, (sorry for my english)
i got a running ubuntu server 64bit (14.04) without desktop environnement (no gnome, no kde).
I use it to run some services (i.e apache, mail server...) and a media center application (xbmc).

All is fine at this point, and i can x11vnc the xbmc

But my problem is i want to run a second X display to run a lightweight window manager (flux box) and access it via x11vnc.
So i setup an upstart script :

Code:

exec su -c "xinit /usr/bin/fluxbox $DISPLAY -- /usr/bin/X :$DISPLAY vt8 -bs -nolisten tcp" xbmc

note that $DISPLAY is set to a value different of 0 because "xbmc" already use it.

It works because I can then see a flux box WM running on the new display, BUT the first display (XBMC) is then freezed and i can see in Xorg.0.log the following message :

Code:

II) AIGLX: Suspending AIGLX clients for VT switch

Note that i have a radeon card (HD6450) with radeon oss driver setup for Xorg. I also tried with FBDEV driver but the problem is the same, so i don't think it's driver related.

Any one could help me ?

Many thanks to you !