[SIAPI] [Steam Deck] Jittery joystick camera

[ls-alh]

Game Version

Steam version, up-to-date as of writing

Describe the bug

The default controller scheme for the steam deck has a jittery camera. It seems to only update around 30 fps, tested by limiting the steam deck's compositor to 30 fps and observing similar framerates with moving and looking. Also compared to holding the steam button to temporarily force the touchpad and joystick into mouse mode, which has fluid full-rate camera update speed.

This is observed on an unmodified Steam Deck OLED, at 90fps nominally. I tested both GameMode and Plasma 6 X11 (Desktop Mode). I tested the newest available version with no beta and 1.6.1 via steam's beta feature. This issue happens in all tested environments.

To Reproduce

1. Install and launch on a Steam Deck OLED
2. Confirm default controller layout
3. Launch new game
4. Wait for full camera control (bug starts after bed sequence)
5. Optionally test with limited framerate via the Quick Access Menu

Expected behavior

Smooth camera control in same framerate as rendering

Screenshots

No response

Desktop

Steam Deck OLED
SteamOS 3.7.17

[StefanH-AT]

Huh do you happen to work in QA? Because the wording of this is eerily similar to what I'm getting from commercial QA. Great report! Do you have a video of this happening? Understanding what you mean by jittery camera movement from a text description is pretty difficult

My first guess is that you may just be experiencing unexpected movement from the gyro? By default (I think) we enable gyro look. But yeah without a video it's difficult for me to know what we're looking at here. When I played it on deck I didn't see any issues

[Br0wnie007]

Hello, I also have the same issue too and have attached a video as requested.

clip.mov

[ls-alh]

Hello, I also have the same issue too and have attached a video as requested.

clip.mov

I can confirm this is exactly what my game looked like.

Also, this happens on my desktop PC running Arch Linux. It's not limited to just the Steam Deck.

[orels1]

Can reproduce the same on the latest build of bazzite (fedora).

Switching to joystick mouse via Steam Input configuration somewhat addresses the issue, but has much higher perceived input latency.

The issue seems to still happen when

• Enabling VSync
• Capping the framerate to any value down to like 60 fps
  • Going to 30 and below makes it not possible to see the issue because the game is too stuttery
• Uncapping the framerate

Tested using an Xbox One controller plugged in over USB, running default proton, proton experimental or latest proton GE (10.30 at the time of posting)

[TapGhoul]

Finding this on the deck too. Switching input to mouse input makes it consistent, so does joystick - I think it's specific to the "Touchpad Head Movement" steam input action. Switching to mouse and joystick without a steam input action is smooth.
Additionally, "joystick head movement" is smooth, but behaves like flick stick, except inverted (forward is backward, rotating clockwise rotates me counter-clockwise - are the axis backwards?)
Using "Joystick Head Movement (via Flick Stick)" seems to jump me all over the place even more, as if it's applying flick stick twice.

This is after resetting the input to the stock profile provided by steam input for the game. Maybe it's a bug in the steam input implementation? This behaves like 2 separate bugs, but I wonder if they're related.

Gyro head movement (the steam input action) behaves like touchpad head movement - laggy. Moving all to emulate mouse results in smooth look and properly read input.