Interesting that mode "1920x1080_60" becomes valid when you have nvidia-drm.modeset=0. This just means the KMS part of the Nvidia driver is missing G-Sync support. Actually that's probably to be expected that KMS can't support G-Sync. So this tells me for your particular laptop these are mandatory:
nvidia-drm.modeset=0 i915.modeset=0
or could be simplified now as just:
nomodeset
Can you provide a log from the working 6.4 kernel?
Interesting that mode "1920x1080_60" becomes valid when you have nvidia- drm.modeset= 0. This just means the KMS part of the Nvidia driver is missing G-Sync support. Actually that's probably to be expected that KMS can't support G-Sync. So this tells me for your particular laptop these are mandatory:
nvidia- drm.modeset= 0 i915.modeset=0
or could be simplified now as just:
nomodeset
Can you provide a log from the working 6.4 kernel?