My machine is a Lenovo IdeaCenter A510 Specs:

• CPU: AMD Ryzen 5 3400G with Radeon Vega Graphics
• Disks: Seagate FireCuda 520 SSD ZP500GM30002
• Samsung SSD 870 EVO 500GB SVT02B6Q
• Samsung SSD 870 EVO 500GB SVT02B6Q
• Mem: 32GB
• Disk type: ZFS Raid mirror

pkg install xorg xfce firefox-esr thunderbird tmux irssi vim sudo tigervnc-server

Once all the basics are installed:

pkg install drm-kmod && sysrc kld_list="amdgpu"

I am not using X directly but in a VNC so

echo "startxfce4" > ~/.xinitrc
echo "startxfce4" >> ~/.vnc/xstartup

Edit the file ~/.vnc/xstartup and comment or remove the twm & Now run the vnc server

vncserver

And hopefully your system will load xfce and youll be able to connect