I've found out how /etc/modprobe.d/nvidia-331_hybrid.conf disappeared: nvidia-331's postrm explicitly deletes it, but as it's a conffile reinstalling nvidia-331 doesn't put it back. However, having it present doesn't fix the main bug.
I've found out how /etc/modprobe. d/nvidia- 331_hybrid. conf disappeared: nvidia-331's postrm explicitly deletes it, but as it's a conffile reinstalling nvidia-331 doesn't put it back. However, having it present doesn't fix the main bug.