7 Replies Latest reply on May 19, 2014 1:31 PM by sylvia_intel

    Management Engine Interface: High system load by Deferred Procedure Calls (DPC)


      After booting my Lenovo Thinkpad E540 with an external monitor connected, one core is 50% busy with Deferred Procedure Calls (DPC) and it runs constantly at 100% clock speed (2.2 GHz).

      After unplugging / reconnecting the HDMI cable, the system load goes down to almost 0% and the clock to about 40 %, as it should.

      xperf revealed, that the Intel Management Engine Interface produces the load (Driver: HECIx64.sys, Version from Intel Dec. 17th, 2012).


      After disabling the "Intel Management Engine Interface" AS WELL AS  "Intel 8 Series / C220 Series USB EHCI #2 - 8C2D" in the Device Manager the DPC-load goes down close to zero.


      Are there any real solutions ?


      How to reproduce the high load:

      (1) The Monitor is connected via HDMI, then power on the Thinkpad while shortly opening the Thinkpad.

      (2) After logging in, the Task Manager shows 50% load at one core, the Ressource Monitor shows that all the load is consumed by Deferred Procedure Calls and that the clock is constantly at 100 %.

      (3) Open the Thinkpad and disconnect the HDMI cable. The load goes down to almost zero and the clock below 50%, as it should be.

      (4) Reconnect the HDMI cable and the load stays at almost zero.


      Some Details:
      Thinkpad E540, i7-4702MQ, 8 GB, screen resolution 1920 x 1080
      Monitor HP LP2275w, resolution 1680 x 1050
      Win7 64bit SP1, up to date by Windows and ThinkVantage systemupdate

      The intel IGP is active (not Geforce 740M).
      It does _not_ matter if only the external screen is activated or the internal and externale are expanded or duplicated in the display settings of Windows.


      Thank you for your help.