Thanks for this post My laptop first idled 15-20W, and now is consistently 3-4W. It also can reach C8 state, where beforehand it couldn't get any further than C3. Battery life increased from 3 hrs to 8+ hrs. Unfortunately, updating the drivers didn't seem to work. So I just used the built in windows reset option, and this fixed the issue somehow. I think a windows update caused it to get stuck in C3.