Do either of these help?

(as root):

radeonreg regset 0x6564 0xffffffff
radeonreg regset 0x6568 0xffffffff
radeonreg regset 0x656c 0xffffffff
radeonreg regset 0x6570 0xffffffff

or:

radeonreg regset 0x6acc 0x00000000


You can grab radeonreg here:
http://cgit.freedesktop.org/~airlied/radeontool/

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https://bugs.launchpad.net/bugs/556782

Title:
  [rs690m] Graphics corruption with ati x1200

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