(In reply to comment #23)
> I had a similar problem with my x700 (rv410) radeon, and fixed it with:
>   radeontool light off 
>   radeonreg regset 0x00000284 0x1bd34208 
>   radeonreg regset 0x000002d0 0x003c00a1 
>   radeonreg regset CL:03 0x001c0007 
>   radeonreg regset CL:04 0x0002004a 
>   radeonreg regset CL:05 0x0002004a 
>   radeonreg regset CL:06 0x0002004a 
>   radeontool light on
> 
> Have you guys tried the radeontool light thingy?

Please file a separate bug for this, this should be handled properly in the
driver.  These registers are only relevant for very old radeons so they don't
apply to newer asics.