Make sure you don't have "half-rate shading" turned on the the deck battery settings. I do see a protondb report with similar issues, but everywhere else I see the game discussed no one seems to be complaining about it.
Steam Hardware
A place to discuss and support all Steam Hardware, including Steam Deck, Steam Machine, Steam Frame, and SteamOS in general.
As Lemmy doesn't have flairs yet, you can use these prefixes to indicate what type of post you have made, eg:
[Flair] My post title
The following is a list of suggested flairs:
[Deck] - Steam Deck related.
[Machine] - Steam Machine related.
[Frame] - Steam Frame related.
[Discussion] - General discussion.
[Help] - A request for help or support.
[News] - News about the deck.
[PSA] - Sharing important information.
[Game] - News / info about a game on the deck.
[Update] - An update to a previous post.
[Meta] - Discussion about this community.
If your post is only relevant to one hardware device (Deck/Machine/Frame/etc) please specify which one as part of the title or by using a device flair.
These are not enforced, but they are encouraged.
Rules:
- Follow the rules of Sopuli
- Posts must be related to Steam Hardware or Steam OS in an obvious way.
- No piracy, there are other communities for that.
- Discussion of emulators are allowed, but no discussion on how to illegally acquire ROMs.
- This is a place of civil discussion, no trolling.
- Have fun.
Oh shit, that was turned on. No idea why it was though, as I normally use per-game profiles. Thanks for the suggestion!
Should edit your post with the solution so others can see!
You're not an idiot, I had the same issue with last epoch and it took me a while to understand. Half rate shadering has no side effects on most games so I didn't see this coming 🙍♂️
Wait, it actually does something?
Try setting it to use proton experimental, newer games sometimes depend on features that aren't in the stable versions of proton yet (or are at least buggier/worse in the stable versions)
Edit: also try launching the game from desktop mode. The compositor in steam mode is Wayland-based and desktop mode uses an X11 session by default. The issues you're describing sound a bit like something that's happened to me running games under Wayland on my laptop