XVR-100 bpp

I have a Sun Blade 1500 happily running OpenBSD 4.6 (release).  I've 
just loaded it with 4 (four) XVR-100 framebuffers.  (This box is 
intended to just sit in a corner and drive multiple slideshows).

For the life of me, though, I cannot determine how to get any of those 
frame buffers to run at 24 bpp.  Wsdisplay just represents whatever bpp 
the radeonfb driver reports.  In turn, from the code, it looks like the 
bpp is set once at boot time.  Okay, that's fine, I don't need to change 
them dynamically.

Further, though, it seems set to 8 bpp as a default, taken from the card 
itself (i.e., looking through the getprop*() calls in the driver, and 
then I further confirmed that each card's information dumped from 
OpenPROM yielded "depth: 8").

But, for the life of me, I just can't find how to switch it to anything 
else.  It can't just be changing the card's OpenPROM depth information, 
I imagine that other parameters would have to change with it.  Even it 
that were the case... to be honest, the syntax for successfully changing 
it via eeprom also eludes me.

Can anyone share a clue or hint with me here?

(Bonus points if someone can point me to switching on the DVI output 
instead of HD15... but, frankly, that's a lower priority than getting 
RGB24 output out of it...)

(I also have a small pile of XVR-600 cards, but the driver seems to 
imply that they're only supported at 7 bpp, so that's why I went with 
the XVR-100's.  Would life be easier with PGX-64 cards?)

Thanks,
Bob


-- 
Bob Krzaczek, Chester F. Carlson Center for Imaging Science, RIT
phone +1-585-4757196, email [email protected], icbm 43.0848N 77.6789W