3D acceleration on a G4 Mac Mini with Fedora 12

So, I'm using Fedora 12 on a G4 Power PC Mac Mini. I got the right PPC install disk, and installed it, and things went well. However, the DRI failed to start, so I couldn't use Desktop Effects, Compiz, or anything involving 3D acceleration.

I check the log at /var/log/Xorg.0.log and found "(EE) Static buffer allocation failed. Disabling DRI". It mentioned below that that I need almost 42MB of memory for this depth and resolution. The screen I'm using it on has a resolution of 1360x768.

I tried simply lowering the resolution, but this didn't help, so I googled a bit more. Eventually, I found this thread which featured the following comment:

The error below:

(EE) RADEON(0): Static buffer allocation failed. Disabling DRI.
(EE) RADEON(0): At least 9000 kB of video memory needed at this resolution and depth.

Is caused because the new xrandr module doesn't detect the
weird 1280x600 dimensions: here's what Alex said plus the solution:

Alex Deucher wrote:
> > Add the following line to the display subsection of the screen section
> > of your config:
> >
> > Virtual 1280 600
> >
> > With the new randr code we pre-allocate a framebuffer until we get ttm support.

So now I have glxgears running at a hair raising 400fps instead
of an underwhelming 30fps.

Cheers,

Doug

Of course, my resolution is different, but still, I generated an xorg.conf (since Fedora's X doesn't generate one itself; this was done by going to a terminal without GDM up, typing "Xorg -configure" which creates /root/xorg.conf.new, which I copied to /etc/X11/xorg.conf) and added the line like this:

...

Section "Screen"
  ...
  SubSection "Display"
    Viewport 0 0
    Depth    24
    Virtual  1360 768
  EndSubSection
EndSection

I've omitted most of the file above. I added the Virtual line to each 'SubSection "Display"' I had, so for each depth.

Upon restarting my X server, Desktop Effects were available. Hurrah!