(EE) Cannot run in framebuffer mode (HP Pavilion 595-p0404nz, AMD Radeon™ RX Vega 11 Graphics)

Hello, after a fresh install of freebsd 12 and xorg (once with the very quick <cmd>pkg install ...</cmd>and once with the very slow <cmd>make install</cmd>)
startx i get the error:
Fatal server error:
(EE Cannot run in framebuffer mode. Please specify busIDs for all framebuffer devices

in /var/log/Xorg.0.log (img attached) I find:
(EE) open /dev/dri/card0: No such file or directory
(WW) falling back to old probe method for scfb
scfb trace: probe start
(II) scfb trace :using default device
scfb trace: probe done

with dmesg I get (see d2 attachement).

many thanks
Marco

p.s.This PC is intended only for browsing a mysql/php program on internet. No games
 

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Did you follow the instructions?
Code:
The drm-next-kmod port can be enabled for amdgpu (for AMD GPUs starting with
the HD7000 series / Tahiti) or i915kms (for Intel APUs starting with HD3000 /
Sandy Bridge) through kld_list in /etc/rc.conf. radeonkms for older AMD GPUs
can be loaded and there are some positive reports if EFI boot is NOT enabled
(similar to amdgpu).

For amdgpu: kld_list="amdgpu"
For Intel: kld_list="/boot/modules/i915kms.ko"
For radeonkms: kld_list="/boot/modules/radeonkms.ko"

Please ensure that all users requiring graphics are members of the
"video" group.

Older generations are supported by the stable kms modules (radeonkms / 
i915kms) in base.

And these: Handbook: 5.4. Xorg Configuration
 
hoops, I didn't see instructions.
So, after the installation of drm-next-kmod I added the line
kld_list="amdgpu" to rc.conf
I added the user root to group video (was already in wheel) and rebooted. No improvement
 
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