Steam Deck: Neptune
The Valve Steam Deck LCD / OLD Controller also known as Neptune
Steam Input support
Yes
Linux Kernel Support
Yes, since 4.18 - hid-steam
Udev rules
# Valve USB devices
SUBSYSTEM=="usb", ATTRS{idVendor}=="28de", MODE="0666"
# Steam Controller udev write access
KERNEL=="uinput", SUBSYSTEM=="misc", MODE="0660", GROUP="input", OPTIONS+="static_node=uinput"
# Valve HID devices over USB hidraw
KERNEL=="hidraw*", ATTRS{idVendor}=="28de", MODE="0666"
# Valve HID devices over bluetooth hidraw
KERNEL=="hidraw*", KERNELS=="*28DE:*", MODE="0666"
What are the Official RetroDECK layouts for the Steam Deck?
RetroDECK: Steam Deck - Neptune SIMPLE
RetroDECK: Steam Deck - Neptune FULL