Also, the respective ports under Port Access tab on GUI turn grey when the screen goes off during flickering.
When KA dongle is only USB-connected to the PC device without KVM unit, the "link" LED on the dongle blinks, which should light steadily as there is no data transmission.
The PC itself has two video outputs, when connecting one to KVM via KA dongle and another to a monitor directly, flickering issue will not occur.
The firmware version of the KVM unit and the KA dongles is already the latest.
Update EDID and lower display resolution also don't help.
How to solve this flickering issue?