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

    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 System SpecsSystem Spec

  2.    20 Jul 2015 #2
    Join Date : Dec 2013
    Portsmouth Hampshire
    Posts : 1,130
    Windows 10 x86 14383 Insider Pro and Core 10240

    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 System SpecsSystem Spec


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