[Regression 460 series] Black screen on boot: nvidia-modeset: ERROR: GPU:0: Failed to allocate display engine core DMA push buffer

Happens to me too, driver 460 and 470, ubuntu 21.04, kernel 5.11.0-34-generic #36-Ubuntu SMP.

Changing driver to 460 and 450 with “Software and updates” didn’t solve it.

Needed to change it in the command line as @alex21975, but I also removed unused nvidia packages before reinstalling:

sudo apt purge nvidia-*
sudo apt autoremove
sudo apt install nvidia-driver-450-server

reboot