From owner-freebsd-ppc@FreeBSD.ORG  Sun Mar 30 08:41:38 2014
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Date: Sun, 30 Mar 2014 08:41:38 +0000
From: Alexey Dokuchaev <danfe@FreeBSD.org>
To: Justin Hibbits <chmeeedalf@gmail.com>
Subject: Re: PowerMac G4 graphics issue
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On Sun, Mar 30, 2014 at 07:33:31AM +0000, Alexey Dokuchaev wrote:
> That's true, I don't have r200_dri.so there, but I do have radeon_dri.so;
> why X is trying to load r200 one?

Looks like r200 is correct for newer Radeons.  Adding R200 to DRI_DRIVERS in
/usr/ports/graphics/dri/Makefile and rebuilding/reinstalling the port made
it available, but apparently it was disabled for reason, as it doesn't work:

  (II) AIGLX: Screen 0 is not DRI2 capable
  ...
  (EE) AIGLX error: r200 does not export required DRI extension

libGL with verbose debugging also reports:

  libGL: screen 0 does not appear to be DRI2 capable
  libGL: XF86DRIGetClientDriverName: 5.3.0 r200 (screen 0)
  libGL: OpenDriver: trying /usr/local/lib/dri/r200_dri.so
  libGL error: failed to load driver: r200
  libGL: OpenDriver: trying /usr/local/lib/dri/swrast_dri.so

Does NEW_XORG implies DRI2, or there's a fallback of some sort that can be
used as a workaround?

./danfe