Windows 10: CPU throttling not working properly, bad standby drain

  1. Posts : 146
    Windows 10 Pro 64bit
       19 Jul 2015 #1

    CPU throttling not working properly, bad standby drain

    Just wanted to write this thread so other people can decide if it's worthy to switch to Windows 10 (on a tablet or laptop). I guess it's fine for a desktop and it will run really nicely, however I dont upgrade on a tablet or mobile device, until maybe a few months into the future.

    There seems to be a bug with power-stepping or throttling, maybe connected with Intel Turbo Boost. Ive noticed this already 7 months ago, when I put an insider build on my Dell Venue 8 Pro tablet, and Ive reported it back then a few times.

    Three days ago I tested 10240 build, clean install of course, which will be RTM, again on my Venue, and the bug is still present.

    The problem is simple: Windows 10 doesnt switch to the CPUs lowest power state, and always idles between 1.3 and 1.8GHz (for my tablets CPU which is a Atom BayTrail). It never goes down to 0.5 or 0.8GHz even if there's 95-99% idle.

    Ive monitored this via task manager but also CPUz.

    The 2nd issue is the power drain in connected standby mode, which I also monitored over 48h. The result was a drain of about 1.1mW/h, which is bad and way outside the norm, Microsoft gave for connected standby, which should be at about 0.3mW/h.

    You can google this and there are other reported by poeple way back to 9 months who reported this too, but oh well, it wasnt fixed until now it seemed or maybe not for all processors/models.

    So Ive switched back to Windows 8.1, and did the same power testings, resulting in a drain of 0.35mW/h over 12h, which is fine.

    I guess it's a driver issue maybe with Intel power policy drivers, or even something with Windows 10 handles things. I hope this will get fixed soon, otherwise I wont upgrade with my tablets or laptops to Windows 10.
      My ComputerSystem Spec

  2. Fafhrd's Avatar
    Posts : 1,928
    Windows 10 x86 14383 Insider Pro and Core 10240
       20 Jul 2015 #2

    Chipset drivers probably replaced by Microsoft generic - not the best - Latest Intel Chipset Device Software - Windows 10 Forums for intel. For others see sticky threads at top of Drivers and Hardware forum.
      My ComputersSystem Spec


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