Moving to the NVIDIA 364.16 driver corrected this problem:
https://wiki.archlinux.org/index.php/Kernel_mode_setting
We are using a 2m DisplayPort cable from the MST to the monitor’s DisplayPort input, no adapters.
The monitors are configured to disable the power saver.
1 CAC-1335 1440p 240hz Flickering
2 CSV-1585 only works with < 4k 60Hz
3 Club 3D CAC-1510-A USB C to Dual Link DVI-D Adapter HDCP Off not working
4 Is there a DP2.1 to HDMI2.1 Adapter supporting 4K@144Hz with VRR support?
5 Cheapass Crash Cart Monitor
6 CSV-1583 power managment laptop
7 Mac Pro 2019 (7,1) and Apple Cinema 30
8 CAC-1331
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