So here's a weird one. I upgraded my HP Envy-Pro 4 (rev b000) Ultrabook to Mint 16, and for the most part, everything works great. One oddity I noticed the next day though - the battery had worn down a little overnight. This is a work system, so at the end of the day, it's unplugged and locked in a drawer. I'm noticing 10 to 15% battery loss during an overnight period.
When powering off, I use the built in shutdown command to do it, just as I have for years. It goes through a typical powerdown (same thing you'd see via shutdown -h now in the console) and shuts off. Or appears to, but there has to be something still active in some sort of lower power state. If I turn the system on, then immediately turn it off again via the power button, I don't get the drain. This didn't happen in Mint 15.
Anyone have any idea what could be causing this?