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Thread: Does anyone know when OpenSource ATI GPUs power options are fixed?

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  1. #1
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    Angry Does anyone know when OpenSource ATI GPUs power options are fixed?

    I got 6850HD but cannot use it proper due it's power options. Here we are using world the most pricey electricity and using GPU on default bills me much on 7/24 system.
    If I use it on forced low power profile, than animations became jerky.
    Also dynpm method doesn't working well. Can't change clock as needed and also give blinks when changing clocks( from low power to med/high ).

    AFAIK, for a years no one working on it... Why? I believe there aren't much work left.
    I remember on some interview with ATI, they said disabled tessellation on catalyst due lowering power usage, because no game using it and they "love polar bears" much more than others (nVidia). Do they quit loving polar bears?
    I think proper dynpm controls are more important for laptop users due limited batteries.

    Why no one working on it and why we can't use our GPUs as efficient as Catalyst. Does power controlling on GPU has any IPs like DRM too?

  2. #2
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    Well, I got the answer somewhere here that the power management code alone in fglrx is bigger than the whole mesa codebase... So it's not easy to duplicate its functionality completely.

    http://www.x.org/wiki/RadeonFeature says it's ready but I definitely have more power drain on radeon than fglrx on HD 6550 mobile. Not much, so it's kind of acceptable, but still noticeable.

  3. #3
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    Yes on idle and forcing low profile, there are 10~20 Watts higher than fglrx for my 6850HD.
    But even if you accept this loss, you needed to adjust your card clocking by hand and need to accept jerky graphics also.
    Because there is no good re-clocking... And re-clocking "flickers" screen.

    I wonder If nVidia and/or Intel has similar power problems with their GPUs...
    Might it's time to leave AMD GPUs...

  4. #4
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    I noticed it depends A LOT on the card, on my HD5870 there was no difference between low and catalyst, also dynpm did work flawlessly (on the 5870 or the 3870, I don't remember which one).

  5. #5
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    Anyway I do agree amd should put more attention on power management, I will NEVER buy a laptop with an amd apu if they aren't going to offer proper power management: it's VERY, VERY important on a laptop.

  6. #6
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    Quote Originally Posted by darkbasic View Post
    Anyway I do agree amd should put more attention on power management, I will NEVER buy a laptop with an amd apu if they aren't going to offer proper power management: it's VERY, VERY important on a laptop.
    Yep, that is right but: what do you intend to buy then? None of the others is any better.
    In my case I used fglrx til the free driver set was mature enough. (3300 onboard/3870 and now 5670. I actually bought that 5670 at a time where also 6xxx series and first 7xxx were available but it was fine to replace my 3870, use less power and it was better supported at that time by the free drivers. And a bit cheaper. )

    On topic:
    Some years before I measured power uptake of my main system (directly at the wall). And with fglrx it was lowest, then Catalyst on Windows and then free drivers. It was on idle, card was a dedicated 3870. With onboard chips difference was not really much but then they have less functions.
    Today, with power-profiles and "low" setting I got fairly good values on my 5670, comparable to Catalyst on XP. Still it might vary from HW to HW, either by chipset generation or even by card manufacturer (e.g. overclocked or undervolted by default).

    As I was informed by John Bridgman PM is currently a lot of "works everywhere stuff". There are many things that work on a lot but not all HW so they are not activated yet (if I am allowed to quote: "works on many systems but not enough that we recommend using it" ). PM in the Radeon Feature Matrix is relatively generic, maybe it will later be split up in several sub-sections. I followed the development for a long time and it got better and better, sometimes slowly but steady. Of course it's not a matter of a few days so I got used to be patient even though I would love to have a SI series card with working UVD, OGL 4.2 and perfect power management right now.

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