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  1. Qt
  2. QTBUG-60216

High CPU usage (1/2) core when using QT_OPENGL=desktop with Intel HD 4600 graphics driver

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    • Icon: Bug Bug
    • Resolution: Out of scope
    • Icon: P3: Somewhat important P3: Somewhat important
    • None
    • 5.8.0
    • GUI: OpenGL
    • None
    • Win7 64bit SP1 (with all patches as of 2017-04-13)
      Intel i5-4590 CPU
      Intel HD 4600 driver 10.18.14.4578 (could not install latest version though)
      NVIDA GeForce 7600GS driver 9.18.13.908 (seems to be the latest)

      Starting Qt-Creator 4.3b1 out of the box (equivalent to QT_OPENGL=desktop) results in high CPU usage consuming about half a CPU core's performance (12% on my 4 Core system)

      0 ntdll.dll!ZwRequestWaitReplyPort+0xa
      1 dwmapi.dll!DwmSetWindowAttribute+0x1cc
      2 dwmapi.dll!DwmSetWindowAttribute+0x3d0
      3 dwmapi.dll!Ordinal132+0x97a
      4 dwmapi.dll!DwmSetWindowAttribute+0x2cc
      5 dwmapi.dll!DwmFlush+0x92
      6 ig75icd64.dll!DrvValidateVersion+0x139a
      7 kernel32.dll!BaseThreadInitThunk+0xd
      8 ntdll.dll!RtlUserThreadStart+0x21

      Using QT_OPENGL=software and QT_OPENGL=angle is both fine.
      Tested with both 32bit and 64bit Version

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            lagocs Laszlo Agocs
            skybow Tilman Skobowsky
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              Created:
              Updated:
              Resolved:

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