Problem with GPU Randeon Vega 8 Graphics from AMD Ryzen 3 3200G

[Dimitris P]

 Hello all today I got my new pc that includes AMD Ryzen 3 3200G and has
Radeon Vega 8 Graphics, there is no other GPU. I have install debian
through netistall and upgrade it to debian testing. I have installed the
firmware-amd-graphics and when I am booting I am getting a black login
prompt and not the gnome. Here are my 2 pastes from dmesg and
/var/log/X.org.0.log
 https://paste.debian.net/1134031
 https://paste.debian.net/1134032
 Thank you and hope to have a solution