Hi! I’m not currently a Kubuntu user, but I have been in the past, and I do have an AMD+NVIDIA hybrid laptop…just checking, what method did you use to install the NVIDIA drivers?
I wonder if that might be related to issues like this - Flickering issues SDDM on first boot - that was posted back in March, which could be around when software versions would have been frozen for Kubuntu 25.04?
Do you know if you have any specific kernel parameters set, either for the AMD or the NVIDIA GPUs?
And, just checking, is the desktop otherwise behaving normally when you log in the first time - except that you see (through nvidia-smi perhaps?) that everything is using the dGPU?