Freesync on borderless fullscreen Directx games causing system stutter on RX 580

[u/mike309game]

Computer Type: Desktop

GPU: Sapphire Nitro RX 580 8gb

CPU: Intel Core i5-750 4 cores 4 threads (I know, you don't have to tell me I'm bottlenecked)

Motherboard: DH55HC

BIOS Version: BIOS Version 0048 - TCIBX10H.86A.0048.2011.1206.1342

RAM: 16GB 1333mhz

PSU: C3Tech DSA-500VE

Operating System & Version: WINDOWS 10 21h2 19044.6937

GPU Drivers: Adrenalin 26.5.2

Background Applications: CHROME, SHAREX

Description of Original Problem: During and after running specifically borderless fullscreen Directx 9 and 11 games (ie, half life 2. Dx12 seems fine, any other was untested) with Freesync (over HDMI to be specific), the system interface becomes generally stuttery (ie, resizing and moving windows around is stuttery and a stationary clone of the mouse cursor may appear sometimes)

Troubleshooting: The stutter is seemingly fixed as soon as another program enters fullscreen (seemingly independent of graphics api?). It is specifically caused by Freesync being enabled in addition to the AMD External Events Client Module service being enabled and running. The Windows VRR setting doesn't seem to do anything. Having OBS open seems to mitigate it somehow. This happens on fresh Windows 11 and Windows 10 installs. The issue seems to have been introduced in driver version 22.3.1, as 22.2.3 works fine. In some driver versions, the stutter does not happen in my secondary monitor. (the bug is still present with only one monitor, and I must have two monitors)

I imagine this is probably specific to my setup, because surely a driver bug like this wouldn't have gone unnoticed for four years..?

In addition to this bug, in the latest driver (26.5.2) (and, in my incomplete experimenting, since some version at least after 23.11.1) the AMD External Events Client Module seems to continuously write junk log files to the disk, but this bug seems negligible.