1. Try Proton experimental
2. Try this command in the launching options: PROTON_ENABLE_AMD_AGS=1 %command%

How old is your lcd deck? It may have degraded battery or some issue with controller tbh. 70 mins is too low

You can try launching a game in 4:3 resolution and then set the scaling mode to “stretch” and scaling filter to fsr. SD’s screen is 16:10 so 4:3 stretching would look less weird than on 16:9, at least for me.

You can if you have Micron ram chips and lucky with silicon lottery. However if you’re not lucky your deck would be bricked and you would have to reflash bios with a chip programmer

Try Proton experimental

Tbh I think the strength of SteamOS is that it’s tailored for Steam Deck. Imo there’s no need for general edition, people already can choose from plenty of gaming oriented linux distros if they want. SteamOS can be left as a device specific OS for devices like deck, possible steam machines 2 or other handhelds (as long as it’s open source)