Running a Dell Precision 7530, with an Intel UHD 630 iGPU, and NVIDIA Quadro RTX 5000 Max-Q dGPU. I have a rather unusual display output layout:
This image itself taken from this technical page (especially top left corner, detailing ‘DGFF card’)
I observe the same issues as everyone else:
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Setting the monitor connected to the NVIDIA GPU as the only display (aka NVIDIA-G0 sink) causes extreme compositing lag; however, the cursor works at full refresh rate. This is unusable. Clearly the reverse PRIME implementation needs work.
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Mirroring/extending the laptop and NVIDIA-G0 sink displays mitigates this problem somewhat, but there is still obvious lag and latency. My 144 Hz LG 27GL83-A display with G-Sync can only run at 75 Hz in this mode, and there is obvious tearing, etc.
A great new feature, but the implementation leaves a lot to be desired.
It is to be noted that my notebook (as shown in the image above) allows the dGPU to run alone, and in this case, KDE is composited perfectly, and the driver even detects and enables the G-Sync capability.