Controller issues when using steam-plus session

[alkazar]

Testing on ChimeraOS unstable with Xbox Series controller connected via official dongle, I found the following:

• Controller is duplicated with builtin RetroArch emulation
• Controller input does not work with builtin emulation despite being recognized (not an OGUI issue, controller configuration just needs an update for OGUI)
• Controller is duplicated in Steam controller configuration
• Controller does not respond during "Test Device Inputs" in Steam controller settings

Other notes:

• Steam games correctly detect the connected physical controllers
• Connecting a second controller results in 4 controllers reported by Steam and RetroArch
• Enabling and disabling SDL HIDAPI does not change the behaviour even after a restart

[philmmanjaro]

I see similar issue on the ALLY with built-in controller. When I wanted to have mouse control in desktop mode, I had to adjust that setting on all 4 controllers visible in SteamUI. However, I use an older version of opengamepad-sessions before the split to the new gamescope-session approach already.

[ShadowApex]

I believe this is primarily related to us recently removing "device hiding", where we move the event device in /dev/input to a hidden path so apps don't detect the source device.