Sinden lightgun lag and Duck Hunt crash after emulator-specific resolution changes on Steam Deck

[DButter]

Batocera build version

42 2025/10/06 14:36

Your architecture

Steam Deck

Your Graphic Processor Unit(s) (GPU)

7 nm AMD APU 8 RDNA 2 CUs, 1.6GHz (1.6 TFlops FP32)

Issue description

I’m running Batocera on a Steam Deck, booted via USB stick while docked on a Steam Deck stand. ROMs and BIOS files are provided via a network mount. Video and audio output are over HDMI to a 4K display. Video and audio output resolution is set to auto.

I’m trying to get Sinden lightguns working and testing with Duck Hunt. Initially the lightgun was working, but the game window was very small. I changed emulator-specific resolution settings to try to fix that. After doing so, the lightgun now has severe lag even in the normal menus, and Duck Hunt crashes on startup.

I’m not sure which specific setting caused this, and I don’t know how to revert the emulator back to the previous working state.

Detailed reproduction steps

install on a usb steck via etcher
change steam deck bios to boot from usb stick per default
connect usb stick, screen, sinden light gun to steam dock and connect the steam deck to the dock
start steam deck
set rom and bios mounts to network share
set audio and video output to display
set Nintendo Entertainment System Resolution to 1920x1080
start Duck Hunt

Details of any attempts to fix this yourself

played around with the system and emulator resolution

Details of any modifications you have made to Batocera.

other than the network mounts and running it off a usb stick, no

Logs and data

batocera-support-20260104231445.tar.gz

[Tovarichtch]

You've done too many things that you are not supposed to.

Only change the decoration.

Decoration set -> Stretch bezels (4K & ultrawide)

Or you can change your video system settings to 1920x1080p globally in the menu. Do not force it to 1920x1080p via RetroArch or video mode in EmulationStation, things will break.

[DButter]

You've done too many things that you are not supposed to.

story of my life

[DButter]

I’ve done a total system reset and only set up:

1. the main display output
2. BIOS, ROMs, and saves
3. the Wi-Fi settings
4. the decoration set

It kind of works now. I say “kind of” because the Sinden sometimes goes crazy in the main menu. I’m not sure if that’s caused by the Xbox controller also being plugged into the dock, or something else.

I can play Duck Hunt, but the menu itself still sometimes freezes, which might also be connected to the light gun being unstable

[Tovarichtch]

What does Sinden sometimes goes crazy in the main menu mean?