enable nvidia power management:

• http://download.nvidia.com/XFree86/Linux-x86_64/435.17/README/dynamicpowermanagement.html
• https://github.com/Askannz/optimus-manager/wiki/A-guide--to-power-management-options

set startup_mode=hybrid in /etc/optimus-manager/optimus-manager.conf

switch to hybrid

optimus-manager --switch hybrid
optimus-manager --print-mode