Fedora 25 upgrade woes

[Denis Leroy]

Hi List,

So I updated both my Fedora laptops from 24 to 25, resulting in both 
booting into black screens with no login dialogs and no way of going 
into a console or looking at logs.

Both systems are very different. One is a Lenovo, built-in Intel 
graphics support and XFCE, the other is a Dell with a AMD Firepro M5100 
graphics card running Cinnamon. Yet the result is the same. I assumed 
Wayland is at fault here, however I noticed both systems work fine if I 
boot with an older kernel:

kernel-4.8.6-300.fc25.x86_64 : works

kernel-4.8.8-300.fc25.x86_64 : nope

I had some trouble finding further info on this looking at various 
forums and mailing lists, hence my message here. Any insight appreciated.