Usually my go-to for "Linux problems" is "tear down the VM and start a new one", but a few days ago my Manjaro rig at home lost power, and bluetooth wouldn't work upon restart. I wracked my brain, pored through forum threads, man pages, and LFS, but nothing really helped. It looked like several different problems at once, but none of the individual fixes worked, or only worked for minutes at a time. I stepped away from the problem for a while, as one does, while I mused about the way troubleshooting works, and how my early life with Windows and now modern containerization has predisposed me to certain types of solu-- wait, I've got it! rmmod the bluetooth modules, modprobe 'em back in. Everything worked flawlessly. I'm not sure what I learned.

*sigh*