(In reply to Brian Schott from comment #3)
> I think that I'm seeing something related with my 2700u Inspiron 7375.
> 
> If I have compositing enabled in XFWM4, the system will immediately stop
> responding after logging in with LightDM. If the window manager compositing
> is disabled, I'm able to log in, but then there is graphical corruption.
> 
> With git bisect I traced the problem back to
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/
> ?h=df8368be1382&id=df8368be1382b442384507a5147c89978cd60702
> 
> I can edit the source file, and by only changing the KMS_DRIVER_MINOR
> definition from 32 to 30, get the system working correctly with 5.2.0.

I couldn't reproduce the problem (Ryzen 7 PRO 2700U laptop).

Could you list the version number of the various component involved (kernel,
mesa, xf86-video-amdgpu and libdrm) please?

Also can you reproduce the problem with another desktop environment?