CPU can't be idle in dual graphics


  1. Posts : 16
    Windows 10 Pro 64 bit
       #1

    CPU can't be idle in dual graphics


    My laptop Sony VAIO has dual graphics Intel HD 4000 and Radeon HD 7600M (switchable) with Windows 10 (1809). It can play 3D games using HD 7600M properly.

    I notice there is something strange in Task Manager, CPU can't be idle and the clock speed changes contiuously nearing max speed clock (2.5 GHz). If Windows is idle in 10 or 20 minutes, it will freeze.

    If Radeon HD 7600M is disabled in Device Manager, CPU is able to be idle and the clock can be low 1.2GHz.

    I thought there was a bug in HD 7600M driver that came from Windows Update, so I updated to the latest version from AMD website (either Catalyst or Crimson). Apparently the problem is still there.

    I attached 3 screenshots of Task Manager below.

    Please help me, how can I fix this problem?

    Pic 1: CPU can't be idle (bad)
    CPU can't be idle in dual graphics-bad1.png

    Pic 2: Detail of Task Manager
    CPU can't be idle in dual graphics-bad2.png

    Pic 3: CPU can be idle (good)
    CPU can't be idle in dual graphics-good.png
    Thanks
      My Computer

  2. bro67's Avatar
    Posts : 8,350
    Mac OS Catalina
       #2

    Download SysInternals Process Explorer from microsoft.com to get an idea of the sub-process that is causing the CPU spike.
      My Computers


  3. Posts : 16
    Windows 10 Pro 64 bit
    Thread Starter
       #3

    bro67 said:
    Download SysInternals Process Explorer from microsoft.com to get an idea of the sub-process that is causing the CPU spike.

    atikmdag.sys seems to be the culprit. I googled and found that atikmdag.sys is very common problem, caused BSOD for several years and there is no satisfactory solution yet.

    I think this is one of the most important things that should be fixed by AMD

    Thanks bro67
      My Computer


  4. Posts : 16
    Windows 10 Pro 64 bit
    Thread Starter
       #4

    SOLVED !
    Display driver from http://leshcatlabs.net solves the problem
      My Computer


 

  Related Discussions
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 06:49.
Find Us




Windows 10 Forums