Running Ubuntu 20.04. This past Monday it updated to the Nvidia 450 driver (1080 Ti). At first, apt upgrade just removed the 440 driver and refused to install the new one, but in the additional drivers utility I was able to install the new 450 driver. Since installing it, the HDMI audio stops working and the option to select it as an output device disappears when I lock my screen (Meta (windows key) + L) and unlock with my password. A reboot recovers the HDMI audio. Anyone know what's going on/how to fix? SPDIF never stops working.