Radeon KMS doesn't work.

[Wakko Warner]

I have a Dell Inspiron 5100 with an ATI Radeon Mobility M7 (7500 R100
PCI ID 1002:4c57 sub 1028:0149).

Immediately when radeon.ko is loaded, the screen goes blank (The backlight
stays on).  I have fbcon compiled into the kernel (I also tried as module). 
I am unable to get the screen to work again until I reboot.  The logs did
not appear to have any errors after the module loaded.  The system was still
responsive on the network.

I tried kernels 2.6.33 and 2.6.34.

I can provide kernel output if needed.

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