It would be good to show the spam messaging from the journal. Is it related to nvidia-powerd.service? If so you could have tried restarting it or even disable it if it’s that annoying.
With the majority of systems that particular service is not functional since it only works with very specific GPUs on certain optimus designed laptops. The error messages during boot are meaningless on other systems.
Tbh, it is not really a problem but somehow it doesn’t feel right to have some thing in your system blowing up the logs. And it could be either really harmless or a symptom for something more ciritcal - I just didn’t want to find out
After downgrading just the nvidia packages the message is gone, so clear to me that it’s nvidia.
You could try restarting it and or disabling it if it still doesn’t work and you get the errors on the 550.76 drivers. I’m not sure if this is the answer or not?