Bug#897338: sddm: Cannot launch SDDM at boot time and from console

[Jens Radloff <plixplox@yahoo.de>]

Hi,

I have found a solution for the behaviour on my machine with an AMD Radeon 
graphic card and with regard to Debian Buster 10.0, by doing a search on the 
Internet.

The following packets need to be installed:

firmware-linux
firmware-linux-nonfree
libdrm-amdgpu1
xserver-xorg-video-amdgpu

I found this information at

https://linuxconfig.org/how-to-install-the-latest-amd-drivers-on-debian-10-buster

Two of these packets were already installed in my Debian Buster installation. 

Now sddm is shown at the end of the start process of Debian Buster, and I can 
successfully log into KDE.

Regards,

Jens