4.19.16-1 does not crash. linux-image-4.19.0-0.bpo.2-amd 4.19.16-1~bpo9+1 (stretch-backports) but one has to update to firmware-amd-graphics 20190114-1 (from testing buster) otherwise X does not start with firmware-amd-graphics 20161130-4 (from stretch) Kind Regards, Franck