https://bugs.freedesktop.org/show_bug.cgi?id=41664
--- Comment #7 from Alex Deucher agd5f@yahoo.com 2011-10-11 14:02:08 PDT --- Your OEM only defined two power state: default and overclock. The driver sticks to the states defined in the vbios since they have been validated and are known to been good combinations. You could in theory define your own low power state and hack it up in the driver, but certain clock combinations cause stability problems on some cards so YMMV.