Originally Posted by gbil
Regarding the kernel message I did a search and found some kernel bug reports about it. Can you check if this message is repeated during the video playback?
I generated the bug file a couple of times and ran grep DoRxHighPower on it to see if new instances show up each time. They do, all the time. In fact, about 20 lines containing that text within the space of about 30 secs. So I conclude from that that the message is repeated continuously (and I wasn't doing any video playback).
Regarding putting nvidia-settings -l in the desktop manager, does that mean that this command can be run after the x-server was started?