I followed the "mesa route" without any kind of problem. I cannot following the "libMail route" due to my window manager choice: I installed the Armbian Ubuntu Noble version, but I'm running X Window (not Wayland) in order to get the remote display of the Orange PI Plus running on a local monitor; I tried to do this using Wayland without success. I'im running lightdm and xfce4 now. So the /dev/mail0 is still useful or the mesa-vulkan-drivers are enough ? I read some documentation about the hardware acceleration but in my opinion it is too contradictory.
But it is always possible that I'haven't understand anything.....