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Re: Buster: "cannot run in framebuffer mode"

Lucio composed on 2018-09-03 08:52 (UTC+0200):

> 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.

fbdev is an xorg driver provided by xserver-xorg-video-fbdev, not to be confused
with the kernel's framebuffer, /dev/fb0.

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

> # Xorg -configure

That's an anachronism rarely useful for any purpose any more.

> but it didn't solve the problem.

Does /dev/fb0 exist? If not, likely you are missing firmware the AMD gfxcards
depend on, most likely firmware-amd-graphics.
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