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Actually, a combination of the Mach micro=kernel (Carnegie Mellon) and BSD Unix. Mach, itself, grew out of an earlier research operating system called Accent. The CMU Computer Science department was hoping to use Accent not just as a research OS – but also as a basis for the departmental...

Upgrading from a previous version of the OS to Catalina is not a "minor upgrade". It's more like taking a PC that is running Windows 7 or 8 and installing Windows 10. Afterwards, you can't install Windows 7 over Windows 10; major version upgrades go one way.

Yes, but you can't downgrade in place – that is, on the same startup volume, without erasing it. If you had a clone backup of an earlier system (that was recent enough to run on your hardware), you could boot from it.

There are several suggestions in this thread: The consensus seems to be that it is sleep-related behavior; maybe "Power Nap"-related. I'd take all of the proposed workarounds with a grain of salt; but maybe one will work for you.

There are reports on the Internet of other setPowerState() crashes under Catalina. I can't tell for certain, but if you are running Catalina, it is possible that the OS itself (or some other kernel extension) has the bug, and that the AMD video card driver is merely the thing that happened to...