Q Light Controller+

Hello, i used a Raspberry Pi 3 with the BitWizard DMX interface (FT245RL). I did a "fresh" manual installation after the instructions (User guide Document revision: 1.5) Everything works fine, "/etc/init.d/qlcplus start" executed manually or automatic when start the RPI3. The DMX Output over the UART on the Bitwizard interface works. But now my problem: is there a a way, that qlcplus worked with xcb-mode (qlcplus -platform xcb)? When I start qlcplus from the desktop with xcb-option the Output on the UART for the Bitwizard Interface don't work. Not even when I run:
echo 18 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio18/direction
echo 1 > /sys/class/gpio/gpio18/value
manually in the terminal.
Is there a possibility or am I just too stupid

Best regards
Ronny

I found the answer to the problem myself It is a "problem" of user rights.

1. Deactivation autostart of the qlcplus service with: sudo update-rc.d -f qlcplus remove
2. add to the /etc/rc.local:
echo 18 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio18/direction
echo 1 > /sys/class/gpio/gpio18/value
3. change /usr/share/applications/qlcplus.desktop
Exec=sudo qlcplus -platform xcb --web --open %f
or start it manually from the terminal with: sudo qlcplus -platform xcb ...
Without "sudo" the uart issue does not work.

Since I prefer to start qlcplus manually anyway, that's just the right configuration for me.

Best regards
Ronny