[Fixed] 5k 120hz bug in nvidia driver?

[rvdende]

Vive Pro 2 — 4896x2448 DSC modes render the left half of the framebuffer on both eyes (NVIDIA)

Working notes for #65.

Status: ROOT CAUSE FOUND AND FIXED. It is not a DSC bug. It is a 2Heads1OR (merge mode)
viewport bug in nvidia-modeset: at modeset time every hardware head has its viewport origin
hardcoded to x=0, ignoring mergeHeadSection, so both merge heads scan out the left half of the
framebuffer. One-line fix, verified working at 4896x2448@120 on a HTC Vive Pro 2

[rvdende]

Got it working! Here is my PR to nvidia https://github.com/NVIDIA/open-gpu-kernel-modules/pull/1262/changes
5k 120fps is so worth it by the way!

[WorldofShadows]

You sir are an absolute genius!
Thank you so much :D
I was tinkering the last weeks to find out why all Res 0-3 were perfect and the instant i switched to the DSC highres modes 4+5 the right eye was so hard off.
Your change solved it completely.
I was pulling my hair, because the problem happened with this driver and even with envision/monado. So something had to be off on nvidias side (again). I crawled through the source when i saw your post here and .. i am really happy now :D
The last use-case i even had my Win11 dual boot for is falling with this :)

Only thing left for me is a slight fisheye or strange distortion.
With Envision it gets better on the Fallback Distortion and set IPD value ..
I'll keep tinkering here :)