Hey man, thanks for your help - based on your posts in this thread, I did check for updates. I used the free version of Driver Booster and that found 11 drivers in need of update, so I did that. I just tried DriverMax and it found 3 more (I did the two free ones I could do today), but still can't access C6. Given DriverMax gave me a new Apple USB Controller driver, I ran a powercfg to check if the three USB Selective Suspend errors I've always gotten (on this laptop and the 2019 I'm comparing it to) were still there. They are, unfortunately - the device ID is Intel(R) USB 3.0 eXtensible Host Controller, and I've updated the drivers for that both from Intel and from Driver Booster. Additionally, there are these errors (again, not new - they're on the 2019 Macbook Air that can access C6 as well as this 2020 Macbook Air that can't). I just opened the 2019 Macbook Air and checked the C-states on Throttlestop to make sure I wasn't going crazy - interestingly, C3 isn't utilised at all. 10% of the load is sitting in C2, 90% is sitting in C6. I still haven't even been able to enable C6 on this machine at all. Yesterday I sat down with Device Manager (again) and disabled everything with Throttlestop and the C-states window open to see if that made a difference, going so far as to disable the GPU, trackpad and keyboard - no change. Given this is a 10th gen shiny Ice Lake CPU, my idle PKG power is a joke. I'm very determined to keep trying for C6, I just can't think of anything else to try.