[Bug 234634] xf86-video-ati not working under 12.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234634

            Bug ID: 234634
           Summary: xf86-video-ati not working under 12.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: bourne.identity at hotmail.com

I was using Lumina as my DE till this morning on my FreeBSD 12.0 box, and
things worked fine. My box has a Radeon R5 230 (Caicos) graphics card.

In the afternoon, I installed kde5 + xorg + xf86-video-ati + drm-kmod (after
'pkg delete -a -f'), and suddenly upon reboot I have lost the ability to start
X. The error message on the console is "drmn0: error: No GEM object associated
to handle 0x00000384, can't create framebuffer".

kldstat shows radeonkms.ko and drm2.ko loaded. (radeonkms get loaded in my box
from /etc/rc.local).

I tried uninstalling xf86-video-ati/drm-kmod and swapping in the legacy ports
drm-legacy-kmod and xf86-video-ati-legacy. With the legacy ports, X starts up
but the desktop behaves weird, streaking and flashing all over. So I reverted
to xf86-video-ati/drm-kmod, and now am unable to start X again.

A couple of interesting lines from Xorg log are as under:

[   105.562] failed to add FB for modeset
[   105.562] (WW) RADEON(0): Failed to set mode on CRTC 0
[   105.593] (EE) RADEON(0): Failed to enable any CRTC

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