Hey fyi and for posterity, on SteamDeck I have the same issue and the cause is the same as outlined above (modern standby). I would love to hear more from folks who don't have this out of the box.
The fix is simple but I have to wonder why it's not set by default
Ideally the Steamdeck would come with hibernation after timeout and FDE enabled by default, but it doesn't. Still love it, and I'm glad/grateful it's open enough to enable these features on my own
I got a Steam Deck OLED a few months ago. I haven't changed the standby behaviour at all. I can get a bit less than a week of standby + a few hours of gaming out of the box. Currently, my deck is on 52% charge after last charging it 4 days ago and playing ~3 hours of Silksong across those days.
And yes, I'm surprised they don't do something like this out of the box. I really love my Steam Deck overall and I agree, the ability to tweak and enable these features really make it an amazing product. Especially in comparison to my Switch 2 which is great but 100% locked down.
Can't agree on it. For whatever reason my deck OLED do have this issue. Do you use SDcard btw? Since it's really the only difference from a stock device.
The fix is simple but I have to wonder why it's not set by default
https://github.com/nazar256/publications/blob/main/guides/st...
Ideally the Steamdeck would come with hibernation after timeout and FDE enabled by default, but it doesn't. Still love it, and I'm glad/grateful it's open enough to enable these features on my own