HDR distorted colours when using displayport, works fine when connected to HDMI

[XapaJIaMnu]

NVIDIA Open GPU Kernel Modules Version

nvidia-open-565.77-11 (From archlinux.org

Please confirm this issue does not happen with the proprietary driver (of the same version). This issue tracker is only for bugs specific to the open kernel driver.

• I confirm that this does not happen with the proprietary driver package.

Operating System and Version

Arch Linux

Kernel Release

6.12.9-arch1-1

Please confirm you are running a stable release kernel (e.g. not a -rc). We do not accept bug reports for unreleased kernels.

• I am running on a stable kernel release.

Hardware: GPU

NVIDIA GeForce RTX 3090

Describe the bug

565.77 fixed HDMI HDR colours (which now work as expected), however if a monitor is connected to the display port, the colours are washed out (as described in this bug: NVIDIA/egl-wayland#108 )
Monitor: LG - UltraGear 27GP950 4K Ultra HD 27"

Are you aware of the issue?

Thanks,

To Reproduce

Take an HDR capable monitor.
Connect it via HDMI -> HDR works
Coneect it via DP -> HDR washed out

Proprietary and Open Source drivers behave the same with this issue.

Bug Incidence

Always

nvidia-bug-report.log.gz

nvidia-bug-report.log.gz

More Info

No response