Phoronix: Voltage Tweaking Comes To R600+ GPUs On Linux
Earlier this month we reported on vastly improved ATI power management support within the open-source Radeon graphics driver stack for Linux that now supports dynamic power management along with different power management profiles. Following that we provided a detailed look at the ATI Linux power management support with plenty of charts showing how the power management is working out with this latest open-source code...
Right now these are just patches sitting on the DRI mailing list.
So I guess they are not in any of the public branches. Shouldn't take long, though. AFAIK, this is the last major building block still missing from the powersaving stuff. It should be mostly optimisation from there.
This just adds a 'minimum' profile which select the 'low'-powerstate and enables the lowest mode inside this state (the same as the one selected when DPMS has the screen turned off).
Works for me at least
I think that the priority at this point is getting the code into mainline, tested, and stabilised. The power profiles can easily be tweaked once everything is running smoothly. It's probably just a conservative default for the time being, to avoid strange corner cases, not a final decision set in stone.
Am I understanding correctly that this is a drm update, which doesn't need to touch other parts of the stack (like the ddx and Mesa)?