Bad news I'm afraid, looks like the latest firmware (based on
linux-firmware commit bc656509a3cfb60fcdfc905d7e23c18873e4e7b9 from
2019-01-14) broke some RX 580 cards.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer