Strange error when starting sis6326 driver

[walt]

walt wrote:
> X.Org X Server 1.4.0
> Release Date: 5 September 2007
> X Protocol Version 11, Revision 0
> Build Operating System: FreeBSD 7.0-STABLE i386
>
> (==) SIS(0): Depth 24, (==) framebuffer bpp 32
> (EE) SIS(0):                       ERROR:
> (EE) SIS(0): Framebuffer bpp 32 not supported for this chipset
> (EE) SIS(0):                   END OF MESSAGE

> Where did that 32 bpp come from?  The xorg.conf was generated by
> the Xorg server and it says nothing about 32 bits anywhere, and I
> can't see any way in the documentation to change it.

Okay, got it.  I had to add DefaultFbBPP 16 to the config because
the x server didn't add it by default.  This seems like a bug to
me -- the default configuration should not specify a value known
to be invalid.  Earlier version of the sis driver did not behave
this way.