I also got this problem: black login screen and no cursor, switching tty does nothing. I didn’t try to blindly enter the password, my fault. However, the login screen worked via the integrated video card and then, after login, the video output works on both cards.
Removing Plymouth and the splash option did nothing. After some troubleshooting, I read the neighbour topic Dell G7 7588 freeze when booting and its
Problem 2 Solution 1 Comment the
GRUB_GFXMODEandGRUB_GFXPAYLOAD_LINUXlines in the grub configuration to ensure that the NVIDIA graphics are not used by grub during startup.
seem to work for me, even though I have AMD Radeon 