After some discussion with AMD we found that there is a chance that with
only some additional AtomBIOS calls we might be able to get to the same
power levels as fglrx.
With the following patch these are included, but only called if Option
"ForceLowPowerMode" is active. I'd like to have this tested before
I actually commit this. I tested it here and it *seems* to work -
I don't have a power meter at hand for validation at the moment.
What we're still missing are
- PCIe lane changes
- Memory clock changes
- Dynamic clock changes
- Core voltage changes
For all of them enough documentation is available already. So if *this*
patch actually helps reducing power consumption, we probably have enough
information for fully implemented power management.
What we're still missing information for are
- Which clock/voltage settings are stable
- What is the minimum core / memory clock
Maybe we'll find something by looking at the V4 version of the PowerPlay
AtomBIOS table (of which we currently don't know the details yet). Maybe
it helps smoking something while staring at the hexdumps =->>>
CU & happy weekend
Matthias
--
Matthias Hopf