Dolphin, the GameCube and Wii emulator - Forums

Try switching the graphics adapter in Graphics > General back to your Intel GPU instead of your Nvidia card. That doesn't properly make it use your Nvidia GPU, you have to finagle the drivers to let it use that. Follow part two of this guide: https://forums.dolphin-emu.org/Thread-laptop-performance-guide

Which internal resolution didn't work? Have you tried setting it to 1x? Maybe only higher resolution doesn't work.