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Buster: "cannot run in framebuffer mode"

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I have two different Debian Buster/sid systems. The first is a desktop 
PC with AMD RX 580 graphics. It used to work ok until July, then I 
updated it sometime in August, and Xorg broke.

The second is an Acer Aspire5 notebook I've just bought, with AMD RX 540 
graphics. I've installed Debian using the latest Debian Buster testing 
ISO (August 27th, as today's one wasn't available yet), and Xorg doesn't 
start.

Both Xorg.0.log show the same error:

Fatal server error:
Cannot run in framebuffer mode please supply the busIds for all 
framebuffer devices

Both systems run the 4.17 amd64 kernel, but I've also tried a custom 
4.18 kernel on the desktop system, with the same results.

I could find a number of references to that error out there, but all of 
them point either to a solution that does not work in my cases (e.g. 
adding "amdgpu.cik_support=1 radeon.cik_support=0" to the kernel 
comdline) or to a old and already closed bug report, (e.g. 
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=508476)

I'd suspect fbdev was somehow guilty, but the fbdev module isn't even 
listed by lsmod.

I've already tried creating a /etc/X11/xorg.conf file, using

# Xorg -configure

but it didn't solve the problem.

Any clues?

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Thread

Buster: "cannot run in framebuffer mode" Lucio <lucio@sulweb.org> - 2018-09-03 09:00 +0200
  Re: Buster: "cannot run in framebuffer mode" Felix Miata <mrmazda@earthlink.net> - 2018-09-03 09:50 +0200
    Re: Buster: "cannot run in framebuffer mode" Lucio <lucio@sulweb.org> - 2018-09-03 10:40 +0200
      Re: Buster: "cannot run in framebuffer mode" Lucio <lucio@sulweb.org> - 2018-09-04 09:50 +0200

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