This was very helpful. On ubuntuforums, it was suggested that I check
the "Optimus" setting under the "Video" menu in the BIOS. That solved
half the problem. Then following your suggestion and changing the
Multimedia engine in SMPlayer to /usr/bin/mpv solved the other half.
Nvidia currently works
Public bug reported:
Bug in reference to following thread:
https://ubuntuforums.org/showthread.php?t=2461782&s=9ad35211215b73d6cbf67fb92aba2f3d
High CPU usage when playing video. Perhaps video driver is broken.
Thanks
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14