I too have this issue with my Lenovo T530 with Intel/Nvidia Optimus. This PC worked fine until I installed the drivers for my Targus USB3.0 dock, which installs displaylink as part of the drivers.
The odd thing is I did not have this issue on my Lenovo T520 with Intel/Nvidia Optimus, and the main difference between these 2 models is USB2.0 verse USB3.0. Not sure if this means anything...
I was able to get ride of the igfxex.exe crash by renaming the file in c:\windows\system32. I have not seen any obvious ill affects in doing,,, yet...
I also have a second issue, the USB hub in the Targus USB3.0 dock will only work after the first reboot after the dock drivers are installed. Once I reboot again the usb hub will no longer work, and there are no bangs in the device manger too. I don't think this issue is related to renaming the igfxex.exe since this issue occurs before renaming that file.
http://www.targus.com/us/productdeta...RlZ29yeUlkPTEz
Both PC are running Windows 7 x64 Pro.