Compatibility Report

• Name of the game with compatibility issues: Synergy
• Steam AppID of the game: 17520

System Information

• GPU: AMD Radeon RX 6750 XT
• Video driver version: Mesa 24.2.7-arch1.1 (couldnt find amdgpu version)
• Kernel version: 6.12.1-arch1-1
• Link to full system information report as Gist: https://gist.github.com/0x5066/f098236e44cdbab0c50483a422084bf2
• Proton version: Proton Experimental (seems to happen with any proton version regardless)

I confirm:

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

steam-17520.tar.gz

Symptoms

Source Engine titles set to use Proton instead of the native runtime, are prone to report that the game is in insecure mode, when attempting to join a VAC secured server.
So far this has been observed with Synergy, Team Fortress 2 and Half-Life 2: Deathmatch.

Reproduction

Set Synergy to run instead with Proton, launch the game and attempt to join a VAC secured server, you'll encounter "You are in insecure mode. You must restart before you can connect to secure servers."