Please don't close it out.
I'm having this same problem on new Mint 21 install, and hoping there will be a proper solution...soon. Not much info out there, that's how I found this thread. It's why I joined.
Hi, thanks replying and letting me know that v21 is still having the same problem, sounds like someone in "Development" needs to get involved.
I'm still running v20.2 Uma, and despite all of the "Updates" that have come through nothing has fixed this, and I just haven't had time to do a reinstall.
But... about every four days it will just stop working and its back to the black screen, if I reboot or logout/login it will magically just start working again, and you would think that if a file was corrupted it would just stay corrupted unless some file or process made a new version of another file after you logged in, that is kind of where I'm going with this.
I haven't done a whole lot of research on this yet but maybe with the bad Winter weather that is setting in (it was 37F degrees this morning) I'll have more time to be indoors.