works, but stuck at 640 x 480

[hFusion]

Hello everyone.  I recently installed debian "woody" on my Power Mac G4 
AGP Sawtooth with an AGP original Mac Edition ATI Radeon card.  After 
recompiling the 2.4.26 source code, including the drivers for the ATI 
Radeon cards, I reconfigured Xfree86 to use the radeon driver.  Xfree86 
starts fine, but with one small problem.  No matter what resolutions I 
have selected, xfree86 will only run at 640x480.  I have multiple modes 
listed and have tried switching resolutions to no avail.  I also tried 
removing all resolutions except 1280x1024, the one I want.  This also 
did not work.

Any advice would be greatly appreciated.