ThinkPad E560 E550 T450 T450s external display with blinking at the bottom of the screen

Fault symptom:

ThinkPad E560 E550 T450 T450s after the computer connects to the outside through the VGA buckle, may see the phenomenon of flashing or bright line at the bottom of the screen.
Affected models:

ThinkPad E560 E550 T450 T450s, VGA interface explicit

Affected system:

All

Cause analysis:

This problem may be a limitation in the design of the DP-VGA, which can be seen by machines of other brands (not just ThinkPad/Lenovo products.

Solution:

You can adjust the vertical position of the screen image through the setting button of the external monitor until the screen is no longer displayed.

Different display may have different buttons. For details, refer to the explicit instructions.