I have the same problem on 3 MACs. My graphics card is not working either. I'm shocked to see this kind of silence by Apple when there are literally thousands and thousands of posts online, from Apple Developer & Discussion Forums, to Reddit, to MacRumors, and MANY MANY more social sites. I'm also shocked Apple pushed out BigSur when it was clear that the beta testers were reporting the battery issue in big numbers. This is so unlike Apple to behave like typical big corporations that put out junk like Microsoft to make a quick buck, because Apple has built a reputation as quality over quantity which is why we pay more for it.