Windows 10: CPU throttling broken on Intel BayTrail tablets

Discus and support CPU throttling broken on Intel BayTrail tablets in Windows 10 Performance & Maintenance to solve the problem; I have reported this already about 8 months ago while being in the insider program over the Microsoft feedback tools, so I am very pleased that this... Discussion in 'Windows 10 Performance & Maintenance' started by mkdr, Aug 1, 2015.

  1. mkdr Win User

    CPU throttling broken on Intel BayTrail tablets


    I have reported this already about 8 months ago while being in the insider program over the Microsoft feedback tools, so I am very pleased that this bug still is present in the final version...

    The problem is simple, and I have two friends whos Venue 8 Pro show the same behavior after upgrading to Windows 10.

    I have tried a clean install too, I have tried the newest drivers for the Intel Z3700 series Dell had put online for Windows 10, without any success.

    The problem is simple:

    1.) Let Windows idle
    2.) Open TaskManager (or for example CPUz) and monitor CPU throttling

    Under Windows 10, the CPU throttling seem to be broken for at least an Intel Atom BayTrail (3700 series). The CPU always stays around 1.3-1.7GHz @ 1-3% CPU load.

    The same (normal) idle behavior under Windows 8.1 results in the processor correctly using it lowest energy states between 0.5-0.8GHz. This results in a way noticeable faster battery drain.

    2nd bug, mostly related: The battery drain in connected standby is about 3 times higher (~1.1mW/h), compared to Windows 8.1 (~0.33mW/h). The normal drain, by Microsoft itself, is 0.3mW/h for a device supporting connected standby mode.

    Heres a video showing problem 1:
    https://dl.dropboxusercontent.com/u/...in10cpubug.mp4

    You can see how the CPU throttling is not working properly always staying at mid-highe throttling state of the Atom CPU. Normal throttling would be 0.8GHz.

    Here is how it should correctly be:
    https://dl.dropboxusercontent.com/u/...throttling.mp4

    (sorry for the bad quality)

    On my desktop PC and my Asus Ultrabook the throttling work fine, so it seems a problem related to the Atom BayTrail drivers under Windows 10 or a combination of things.

    :)
     
    mkdr, Aug 1, 2015
    #1
  2. ipellant Win User

    Lower CPU power throttling states not working correctly for Intel Atom BayTrail tablets

    CPU throttling broken on Intel BayTrail tablets [​IMG]

    Not a Baytrail problem

    Windows 10240 Home on Unisurf 7" Tablet
     
    ipellant, Aug 1, 2015
    #2
  3. November update broke my tablet [system_thread_exception_not_handled]

    It seems as if most tablets are, at this time, broken by the latest release of Windows 10.

    Not too surprising since even 8.1 has multiple driver issues as well and I am going to try Windows 7 on my baytrail...

    It is said that, for one thing, the Cpu throttling is broken lately and the tablets overheat. In my case I am thinking if I endure a few more freezez perhaps Windows is learning the hardware for its object orientation . ...
     
    William Landreth, Aug 1, 2015
    #3
Thema:

CPU throttling broken on Intel BayTrail tablets

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