We poked around a bit more:
If a friend of mine joins, and its gamepad is recognized it automatically appears in slot 2. If I drag and drop its gamepad to slot 1 then my own gamepad magically appears in slot 2, my friend's gamepad taking slot 1.
I can then reorganize them at will, and my gamepad works ingame.
This is fixed as of March 20 2023's build. Thank you !
Reopening as it happened again. Tried with Lara Croft and the temple of Osiris.
I found a temporary workaround : Enable steam input.
Right click on the game, properties, Controller, Enable Steam Input in the combobox.
Launch the game and start a remote play session. All your controllers (host) will appear.
I'm having a similar issue where, even after installing game-devices-udev and installing steam-input udev rules, any user that joins me in remote play is unable to use controllers. my own controller is fine; other people's controllers wouldn't work.
I'm having a similar issue where, even after installing
game-devices-udevand installing steam-input udev rules, any user that joins me in remote play is unable to use controllers. my own controller is fine; other people's controllers wouldn't work.
Same on linux mint 22.2. Have not been able to get it to work, and have tried every online solution that sounds even remotely relevant. They join, and their controller isn't recognized, and I can only grant them keyboard/mouse controls.
Nothing extracted yet.
Your system information
Please describe your issue in as much detail as possible:
Steam does not see host gamepads when using Remote Play Together. Guests gamepads are fine though (tried Windows).

Gamepads are indeed connected and work well in game, both Steam and non Steam. But can't be seen by Remote Play Together.
Steps for reproducing this issue: