CouchPlay, a split-screen multiplayer tool for Linux, has been released in version v0.6.2.

The update follows version 0.6.1 and consists of many fixes: each player gets a private Steam IPC port, the helper’s audio listener now loads correctly, and controllers are assigned to the right player again after reconnects, rebinds or USB mode switches. Sessions on fractionally scaled outputs now render at physical resolution, the stop shortcut works in the Flatpak thanks to kglobalaccel access, and Steam compatibility tools are mirrored to players for shared games.

This details are from the commits since v0.6.1.

Source: GitHub