> You need to log in (as explained above), enable non-free packages (see > https://wiki.debian.org/SourcesList), and install the firmware-amd- > graphics package. Then you should probably reboot.
This worked! :) Now, I only keep getting the kvm: disabled by bios messages but after 5 sec the login-screen appears. Problem solved. Thanks a lot! -Michael P.S.: Why is the firmware-amd-graphics package neccessary? Debian 8.5 stable worked without this non-free firmware.
