color depth 32 fails on ATI at Latitude C800

Hello,

I cannot realize how to run AT Mobility card (16Mb RAM, display 1400x1050)
in color depth 32. Up to depth 24 everything works fine, and I see in 
'X -depth 24' output:

  (**) R128(0): Depth 24, (--) framebuffer bpp 32
  (II) R128(0): Pixel depth = 24 bits stored in 4 bytes (32 bpp pixmaps)
  (--) Depth 24 pixmap format is 32 bpp

when I run 'X -depth 32':

  (EE) R128(0): Given depth (32) is not supported by r128 driver

I wonder why? Is it a lack of configuration options, or driver is really
incapable? I do not see any restrictions in READMEs. I tried both standard
XFree86-4.1.0_6 port and driver from GATOS project.

I can send both X outputs (for 32 and 24) if somebody is interested...

Thanks,
Alex



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