The Nvidia (440.64) driver fails to build with the incoming 5.6.x kernel. This is not a surprise. Nvidia recently put out a new driver to fix the build errors:
https://www.nvidia.co.uk/Download/driverResults.aspx/159370/en-ukI guess we need to wait for Nvidia 440.82 before using 5.6 kernel (or maybe towo will jump in with a patched version in siduction fixes).