This game is, I think, more CPU bottlenecked than it is GPU bottlenecked, but this is what I personally went with for decent visuals without going too far.

Frame Limit: 48Hz refresh / 24 FPS in performance menu using the per-game profile, Allow Tearing is on. Ingame Frame Rate Cap and VSync are off. Plenty of parts of the game can run at a higher frame rate, especially 30 FPS, but I wanted to try to claw back at least some small modicum of battery life where possible and have some leeway for potential drops below 30. The ingame frame rate cap has some choppy frame pacing so I avoided it.

AMD FSR 2.2: Ultra Quality or Quality

Model Quality: Medium
Shadow Quality: Low
Cloud Quality: Low
Texture Quality: Medium
Texture Filtering: Anisotropic x2 or Trilinear
Instance Distance: Medium
Fog Quality: Low
Detail Distance: Medium
Animation Level of Detail: Medium

Anti-Aliasing: None
Ambient Occlusion: On
Depth of Field: Gaussian
Depth of Field Quality: Quarter
God Rays: On
Bloom: On
Subsurface Scattering: On
Dynamic Crowds: Off

Hopefully this is helpful to you and anyone else who might come looking.

I’ve settled with everything on medium (including textures, otherwise not enough RAM/VRAM in the device), + FSR2 on quality or balanced.

If you want the game to not be a judder-fest, though, you have to be using the Deck’s own framerate limiter. The game’s built-in limiter doesn’t help, even with triple buffering vsync. Thankfully it’s one of those games where input latency doesn’t matter anywhere near as much. 60 Hz, 30 fps cap.

I usually care about battery first, so I have medium details , fsr 2.2 on quality mode, 11w TDP and capped at 30, just started act 2 so I’ll probably ramp up the TDP on act 3

Personal opinion:
Any settings that have FSR on are bad settings 😈

Lol none bg3 broken with update