I ended up with another x86-64 tablet (a Lenovo Yoga Tab 3 Pro) falling into my possession recently with an ancient Android on it, so yet again I am faced with trying to divine what weird hardware Lenovo chose to use so I can wedge a real os on it instead. I've gotten Ubuntu running at this point, but no audio, touchscreen, orientation, or battery yet (nor the built-in dlp projector, but that's the least of my concerns). Might poke it some more later.