I had an air bubble in my brain and an orbital floor fracture (and I shattered my sphenoid) after a bike accident. when I moved, I could both hear and feel the trickle of air moving around in my own brain. it didn’t really hurt (or if it did I was in enough other pain not to notice) but it was one of the oddest sensations ever.
wear helmets y’all.
ACPI is weird and sometimes hardware dependent, so it’s really hard to support it on every device. that’s my current understanding at least.