Failed to start xorg, is your gpu supported?

Hi,
I have a Neo u9-h that would perfectly fit in my car for a project.
I’m building custom image from CoreElec with x11 enable and kodi disable.

I used to have the CoreElec software working just fine with kodi on my tv but when I enable X11 with fluxbox I see on the screen Failed to start xorg, is your gpu supported?

Why would it be ?
Please any input.

The GPU driver doesn’t support X11.