My 8bitDo Ultimate 2 wakes my Steam Deck.

Any Bluetooth controller can wake the Steam Deck. They had to disable it for a while due to bugs but it was re-enabled in a recent update.

Amazing, I tried it when I first got the controller and it didn't seem to work. I'll definitely give it another go because this would make things so much more convenient.

When they first introduced it, my Bluetooth earbuds would wake it up every time I took them out of their case.

The OG steam controller can do it too, at least if you're using the dongle