Hello Awe, I’m sorry to hear that you are having problems with this your computer when trying to use dual display.
I could recommend you to check with Lenovo if your system needs a BIOS update.
Then, you can reinstall the chipset driver and the Management Engine driver.
If the behavior persisted, it could be necessary to reload the operating system.
Regarding the OS, I was checking the following link from Lenovo and it looks like this laptop supports Windows 8.1 only. So it will be very important to talk with them if this could be the cause of the behavior.
thank you for your response.
I have the newest BIOS installed (Verson1.6.1).
My ThinkPad E540 came with Win7 64bit preinstalled. Here in Switzerland you can choose between Win7 and Win 8(.1).
As the machine is quite new (1 month) and I have only installed some common applications - like MS Office - but nothing exotic. So I'm skeptical that a reinstallation of the OS does help.
(a) At the Intel download site I found a newer graphics driver than the newest from Lenovo, that I have installed (Version 22.214.171.12472). Do you think the newer driver from Intel might help?
(b) I don't need remote management of my computer. Do I loose any local functionality, if I deinstall the Management Engine Interface? In the descriptions I found there are some vague hints about Wake-On-LAN, fan control, grafics, etc.
In fact, I could not find a clear statement what it does.
Thank you for your help !
Awe, you can try installing our graphics drivers, but please keep in mind that we have generic drivers and they are made for Intel Motherboards, but you can try.
I would recommend you to install the Management engine driver. However please try to connect the external monitor after the installation of the newer graphic driver, and then install the ME.
ok, thank you.
I will try the new graphics driver. But as I have a Geforce GT 740M too (with Nvidia Optimus), the installation is a bit complicated.
As far as I know, I have to:
Uninstall Nvidia driver and then uninstall Intel graphics driver.
Install newest Intel and then newest Nvidia graphics driver.
After installing the new Intel HD 4600 Graphics Driver version 126.96.36.199.3496 the DPC load is down to almost zero and the clock frequency to around 40% (idle).
"Intel Management Engine Interface" and "Intel 8 Series / C220 Series USB EHCI #2 - 8C2D" deinstalled. But they reinstalled automatically. High DPC load unchanged.
Deinstallation NVIDIA Geforce GT740 M driver.
Deinstallation Intel HD Graphics 4600 driver.
Installation Intel HD 4600 Graphics Driver Version 188.8.131.52.3496.
Success: DPC load after booting with external monitor is down to almost zero, clock frequency at 40 %.
Installation Nvidia Graphics Driver Version 335.23
All is fine, "Intel Management Engine Interface" is active.
Thank you for your help, Sylvia !