Thank you for your attention.
What do you mean?
Last time it was fresh installation.
With default (automatic) settings it freezes at switching from 32bit EFI framebuffer to 64bit radeon fb (as it seems to me).
Just replacing video-ati with video-vesa or disabling radeon kernel module with ‘nomodeset’ (or radeon.modeset=0’) helps to unfreeze booting but LDM fails to start in that case.
So where should I look for ‘amdgpu stuff’?
BTW, I’ve tried to run ‘mkinitcpio’ with and without MODULES="amdgpu radeon’, the result is the same.
Also I’ve tried the debian kernel 4.7.something the result is the same with one exception. There is no need to install something additional to start X after disabling modesetting. It loads Gallium module as in the case of Virtualbox VM.
(One more exception they use simplefb instead of efifb, maybe it’s just a different names)
Seems the problem somewhere in switching between fb with different ‘bit size’ because in the Legacy mode the fb switching works painless.