ATEN KN Series 32-Port KVM over IP Switch with Dual Power/LAN (1-Local + 4-Remote Access) - Manual (Page 221)

Chapter 10. Maintenance
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Display Information
The Display Information button will query and show the locally connected
monitor’s EDID information, as shown here:
Update Adapter Display Info
The Update Adapter Display Info button will query the local monitor’s EDID
information and update it on the Adapter Cable. The EDID information tells
the server's video card about the hardware of the display it is connected to; in
this case the monitor connected to the KVM console.
Use the Display Information button to obtain the local monitor’s Preferred
Resolution (optional), and apply it with the Select Preferred Resolution drop
down menu, then click Write . If the local console is not connected to a
monitor, the default EDID setting is loaded on the adapter cable.