XAX + PG32UCDM3 + XG Mobile 5090 + Nvidia V32.0.15.7324 via DP 2.1 = FAIL !!!
I have added PG32UCDM3 + XG Mobile 5090 over the weekend but instead of having fun, I was having a typical Windows headache. Updated Armoury Crate to the latest INCLUDING Nvidia 32.0.15.7324 as shown in another thread. Searched through countless of posts on Reddit, disabled Fast Startup, changed Sleep to Hibernate, put the device to sleep set to never etc.
Issue: The setup above connected via DP 2.1 worked only first time - every time I removed the Nvidia drivers and reinstalled from AC, it worked one time only for few mins. In fact Windows Explorer hangs and you cannot even restart from taskbar. You have to force turn off. The moment display went black e.g. due to power saving feature, XAX hibernate or whatever it never came back. I saw the blue spinning wheel on the screen. "Blank screen", "spinning wheel", "first time" all those keywords are there and were reproduced in the same or similar scenario by other users over the past.
Today I thought I will check Asus official drivers. There is a discrepancy in Nvidia graphic drivers. The one in AC is V32.0.15.7324 (newer) but the one on Asus page is: V32.0.15.7297 (older). When I installed the older V32.0.15.7297 - everything works!
If anyone is a in a similar boat and found a solution please share. This can be a nightmare for new XG Mobile owners, as clearly the latest Nvidia drivers are broken.
EDIT: The same issue is confirmed now also with HDMI 2.1 bundled in PG32UCDM3.
RESOLVED by Downloading Nvidia app (Thanks u/unsupported_function) and installing the latest drivers, skipping the Armoury Crate. In fact in AC it correctly shows I have a newer Nvidia Driver installed, so it doesn't offer me the "buggy" V32.0.15.7324 anymore...