High refresh rate (>60 Hz) not effectively applied on multi-monitor setup

NVIDIA Open GPU Kernel Modules Version

515.65.01

Does this happen with the proprietary driver (of the same version) as well?

Yes

Operating System and Version

Arch / Cinnamon 5.4.9 DE

Kernel Release

5.19.6-arch1-1

Hardware: GPU

GPU 0: NVIDIA GeForce RTX 2080 (UUID: GPU-b0867e4b-eda0-c18b-65ec-6155a2c0cc55)

Describe the bug

High refresh rate not applied for high refresh rate monitors when connected with additionnal 60 Hz monitors

To Reproduce

-- use X11 (not Wayland)
-- plug at least two monitors: one with refresh rate >60Hz, the others monitors with a max refresh rate of 60Hz
-- Set the high refresh monitor to a value > 60 Hz, for instance 100Hz and other "old" monitors to their max refresh of 60 Hz
-- Measure the effective/real refresh rate on the high refresh rate monitor, (eg. https://www.displayhz.com/)

Bug Incidence

Always

nvidia-bug-report.log.gz

nvidia-bug-report.log

More Info

To note : if the 60 Hz monitors are physically disconnected from the GPU, the high refresh rate monitor will then work automatically and properly at its max refresh rate.

Start by reproducing the issue on X11 with one monitor above 60 Hz and additional monitors capped at 60 Hz, then compare the effective refresh rate with the 60 Hz monitors disconnected. Review the attached nvidia-bug-report.log for the multi-monitor configuration and driver behavior. Done means the high-refresh monitor actually runs at its selected rate while the 60 Hz monitors remain connected.