Issues with Asus PG27UCDM

Hardware

Hello I have some very annoying recurring issues with my new OLED monitor from ASUS.

Product: ASUS ROG Swift PG27UCDM Firmware version: MCM102 Connection: DisplayPort + USB-C to PC (Gigabyte B650I AORUS ULTRA, RTX 4070 Ti Super)

I also use the integrated KVM Switch which I have a M&KB + webcam connected to.

When my PC goes into sleep mode or the monitor turns off after inactivity, I consistently experience two issues:

1.	DisplayPort “No Signal” – The monitor doesn’t detect the signal when the PC wakes up, even though the PC is clearly on.

2.	USB devices (via KVM) – Keyboard, mouse, and webcam do not function until I unplug and reconnect the USB-C cable.

These problems do not occur on cold boot or regular restarts — only after sleep mode or screen timeout.

Troubleshooting performed (unsuccessful):

•	Set DisplayPort version manually to 1.4    in OSD (instead of Auto)
•	Disabled ErP in BIOS
•	Disabled USB Selective Suspend in Windows
•	Set all USB Root Hubs to prevent Windows from turning them off
•	Used the original ASUS USB-C cable, connected directly to the motherboard’s USB-C DP 10G port
•	Confirmed firmware is up-to-date (MCM102) and latest AMD chipset drivers installed

Any help would be greatly appreciated 🙏🏼

Posted May 2, 2025, 11:01 PM UTC

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