Comment # 12
on bug 111482
from Robert
Andrew, you're my hero ;-) While I'm even more sad now (because I now think that this issue will be indeed never be fixed) I now at least can imagine what's going on. As you recommended I changed resolution to 1920x1080. That's quite common I would say. And tata! Indeed "sensors" reported 8W. Then I changed to 3840x2160. Not so usual I guess but the 2nd biggest resolution my monitor supports. Still 8W! And then back to 5120x1440. And tata! 33W :-( That could mean two things: 1) There is a bug somewhere (firmware, driver, ...) with this resolution which causes that high idle power consumption or 2) which is even worse I suspect that with this resolution the 5700XT acts like you have plugged in two monitors. And from what I read throughout all Navi10 reviews multi monitor setups and power consumption was and still is a problem with AMD graphic cards in general. Oh man, that's something I really didn't calculated with :-( Yeah, in that case I can really only hope for the Intel Xe graphics cards next year (if they really build a consumer card which nobody knows yet ;-) ). I still don't understand why in console where KMS is enabled 8W is enough and while running KDE Plasma in that resolution it takes round about 33W. But maybe it really has something to do with acceleration. It doesn't even consider reducing memory clock at least a little bit even if I do nothing and haven't even started any program. That's the funny thing in general: As long as I don't start Firefox, Thunderbird or something like that "sensors" don't even work. It just prints garbage values and takes minutes to complete. If I start one of the programs mentioned above the screen flickers very shortly and afterwards "sensors" works as expected. I guess only the AMD god knows what that means ;-) At least I now know that I can't do anything further. It just would be cool if one of the AMD engineers could confirm my assumption that with a resolution of 5144x1440 the card always runs at highest memory clock speed as it does with a multi monitor setup (from what I've read so far).
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