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Solved: Radeon Mobility M6 LY 3D acceleration on FC2



I wrote,
> I've just done a fresh FC2 install on a Sony PGC-Z1XSP which comes
> with an ATI Radeon Mobility M6 LY and a 1400x1050 panel. 2D is fine,
> but according to glxinfo (and visible with glxgears and gl apps)
> direct rendering isn't enabled.
>
> I believe that the standard kernel and xorg modules should support 3D
> acceleration with this chip, so there's clearly something wrong with
> my setup. I can't see anything obvious (to me) amiss and I've checked
> bugzilla and STFA'd without finding anything helpful, so any advice
> from this list would be much appreciated.

It turns out that this controller doesn't have enough memory (just 16M) 
to support direct rendering at this resolution with 24bpp ... reduce 
the resolution or drop down to 16bpp and direct rendering is enabled.

There's a patch for the XFree86 radeon driver which allows direct 
rendering with low-memory radeons at 24bpp,

  http://www.mail-archive.com/dri-devel lists sourceforge net/msg14926.html

It probably applies to Xorg as well, but I haven't checked. If anyone 
does I'd be grateful if they'd let me know.

Cheers,


Miles



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