When I replace the SD card with a Raspbian OS card I can get the monitor to come out of sleep and return to the GUI. However, this is not the case for HASSbian. I’ve tried a different monitor, re-attaching the HDMI cable and power cycling monitor. Only power cycling the Pi gets things back to normal.
It seems there are some issues with the HASSbian OS, which I’ll try to solve in the mean while by installing a Linux distro first, and then installing Home Assistant separately.
Happened to anyone else? Is my interim solution feasible?