Black screen with AMD graphics card

[Brian Nguyen]

Since upgrading to Debian unstable I can't boot my system. It would show
some text on a black background for a while and then the screen goes black.
Ctrl+Alt+F5 doesn't work.
https://ipfs.io/ipfs/QmRhCQNpCzSb2QAA5erUkFjXhVbuAS4czWfNxuf6iUMzRS