On Debian Stretch and some other Linux distributions there is a small issue with ATI Radeon drivers. Basically, the driver gets loaded too late and Xserver will start behaving badly. There will be dkms modesetting is not supported errors or then something more annoying like startx not working at all. Sometimes it is even worse and you might get randomly broken login to desktop. To fix this issue append radeon to /etc/modules . Continue reading →