<NME> xdummy.conf
<BEF> ADDFILE
<MSG> Start xinit.

<DFF> @@ -0,0 +1,7 @@
+[program:xdummy]
+command=bash -l -c "xinit -- :0 -nolisten tcp vt$XDG_VTNR -noreset +extension GLX +extension RANDR +extension RENDER +extension XFIXES"
+environment=USER=root,QT_X11_NO_MITSHM=1
+directory=/root
+autorestart=true
+stdout_logfile=/var/log/supervisor/xdummy.log
+redirect_stderr=true

Start xinit.