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G15 external monitors portrait & landscape=banding along bottom of portrait

Z Book 15G2
Microsoft Windows 7 (64-bit)

When the computer (N6K85UP#ABA) is attached to a A7E34AA#ABA docking station with two monitors attached, one portrait and the other landscape, and the notebook open (i.e. 3 screens visible), when the computer starts up or awakes, the portrait monitor has banding along its bottom quarter.

 

Workaround:

I can clear the problem by changing the portrait display resolution to any other resolution and the screen is fine once the screen refreshes. I can also clear the problem by unplugging the HDMI cable for that monitor and reconnecting.

 

Failed Fixes:

New monitor and HDMI cable

New mother board

Updated Intel graphic driver

 

My graphics drivers are:

Intel 10.18.14.4280  

DameWare Development 1.1.0.0

Advanced Micro Devices, Inc. 13.352.1018.1001

(as a side question, does this computer use the Intel processor or a graphics card for the display)

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