Have you read this thread and tried all configuration options from there?
https://forums.mauilinux.org/showthread.php?tid=24037
I know it's for Optimus, but some of the things might work for normal nvidia as well...
https://forums.mauilinux.org/showthread.php?tid=24037
I know it's for Optimus, but some of the things might work for normal nvidia as well...