On Tue, 19 Feb 2008 12:38:20 -0500
"Bridgman, John"
Yep, no argument there. We are just in the process of pushing PowerPlay into the closed source drivers so we should have some experience to leverage soon.
-----Original Message----- From: Matthias Hopf [mailto:mhopf@suse.de] Sent: Tuesday, February 19, 2008 11:55 AM To: radeonhd@opensuse.org Cc: Bridgman, John; Deucher, Alexander Subject: Re: [radeonhd] any power saving modes possible?
On Feb 19, 08 11:35:08 -0500, Bridgman, John wrote:
Aren't there AtomBIOS calls for setting engine clock ?
You're correct. We just haven't looked at that, probably because we didn't have any use case for it so far.
OTOH we don't know how this call is actually used, and which limits apply - there are entries in the FirmwareInfo, but they proved to be somewhat unreliable for pixel clocks. And we all know how picky PLLs can be when being programmed wrongly ;-) In contrast to pixel clock you also don't see a wobbly clock immediately, it just might corrupt some calculations. Also there might be side effects, like you might have to reprogram memory refresh etc.
All in all this is something that we have deliberately left as something for future work. We could probably work something that works with the current information available, but there are more pressing issues ATM.
CU
Matthias
There is power register informations already :) see http://www.g2inf.one.pl/~anszom/MBP-ATI/radeontool-qq.patch it's a patch against radeontool http://fdd.com/software/radeon/ I can save few watts with ./radeontool power low I guess we can save more watts but haven't bothered to look deeper (i don't use my laptop that much :)) Cheers, Jerome Glisse -- To unsubscribe, e-mail: radeonhd+unsubscribe@opensuse.org For additional commands, e-mail: radeonhd+help@opensuse.org