DualShock 4 (PS4) controller not working

Compatibility Report

• Name of the game with compatibility issues: Presumably, any Windows game running under Proton. Tried Horizon Zero Dawn, Mass Effect Legendary Edition, Thief (2014)
• Steam AppID of the game: 1151640, 1328670, 239160

System Information

• Kubuntu 21.10
• GPU: GeForce RTX 2080 Ti
• Driver/LLVM version: Nvidia 510.39.01
• Kernel version: 5.13.0-25-lowlatency
• Link to full system information report as Gist: steam_system_info.txt
• Proton version: 6.3-8

I confirm:

• that I haven't found an existing compatibility report for this game.
• that I have checked whether there are updates for my system available.

Symptoms

Upon launching the game, the controller LED lights up blue (normally it is turned off on my system after connection). In the game, buttons or stick movements are not recognized. The touchpad area acts as a mouse touchpad.

The gamepad is working correctly in native games running from Steam, as well as Windows games running under vanilla Wine 7.0-rc6.

Reproduction

1. Connect DualShock 4 over Bluetooth.
2. Launch a game via Proton.
3. Try interacting with the game using the controller (e.g. navigate the in-game menu).

Reproduce the report by connecting a DualShock 4 over Bluetooth and launching a listed game with Proton 6.3-8. Compare controller behavior in Proton with native Steam games and vanilla Wine, using the linked system information and the stated Kubuntu, kernel, and driver versions. Done means the controller buttons and sticks are recognized in-game instead of only acting as a mouse touchpad.