Problems running radeonfb on Radeon Xpress 1100 with 2.6.21 kernel

I've posted this question on the Debian forums but have not got a response, 
so I thought I'd go to the next level and ask here.

I'm having trouble getting the radeonfb framebuffer device to work.  I'm 
running a Radeon Xpress 1100 integrated graphics card on a 1280x800 laptop 
display.  I'm running Debian Unstable using a 2.6.21 kernel, and I know for 
a fact the kernel module is built, and I can even get it to load using 
modprobe.

If I boot with a "video=radeonfb" or "video=radeonfb:1280x800-32@60" 
option, nothing seems to happen differently - no framebuffer is loaded.  
Alternatively, if I do a modprobe on the module, I can load it.  However, 
this doesn't seem to enable a framebuffer.  Nothing shows up under /proc/fb 
or anything like that.  Is there something I'm missing here?

For full details, please take a look at my post here: 
http://forums.debian.net/viewtopic.php?t=17216

Thanks for any help you can provide.

- Paul Goins

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