Far Cry® 4

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Far Cry 4 - Not Launching proton closed

• LucasCerattoRS · 2026-09-26 · Far Cry 4 - Not Launching
  @xairaven Follow-up: I found the root cause. The kernel's split-lock mitigation livelocks the Ubisoft injection handshake (details: https://github.com/ValveSoftware/Proton/issues/2143#issuecomment-5850732240). On an Inte...
• LucasCerattoRS · 2026-09-20 · Far Cry 4 - Not Launching
  > **Update 2026-09-26:** root cause found: the kernel's split-lock mitigation livelocks the Ubisoft injection handshake. Fix: `sudo sysctl -w kernel.split_lock_mitigate=0`. Details: https://github.com/ValveSoftware/Proto...
• felixpelletier · 2026-04-10 · Far Cry 4
  I had the same issue about the process just hanging at start (not even drawing a window). I fixed it with `sudo sysctl kernel.split_lock_mitigate=0`. As soon as I ran that, the game just came to life.
• xairaven · 2026-03-16 · Far Cry 4 - Not Launching
  Thank You very much!
• kisak-valvemaintainer · 2026-03-16 · Far Cry 4 - Not Launching
  Hello @xairaven, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/2143#issuecomment-4069842243.
• kisak-valvemaintainer · 2026-03-16 · Far Cry 4
  Far Cry 4 (298110) - Not Launching Issue transferred from https://github.com/ValveSoftware/Proton/issues/9579. @xairaven posted on 2026-03-16T18:32:14: Bug Report: Far Cry 4 (Steam) fails to launch via Proton on Linux - ...
• ghost · 2025-04-16 · Far Cry 4
  Far Cry 4, GE-Proton9-27: [steam-298110.log](https://github.com/user-attachments/files/19777728/steam-298110.log)
• ghost · 2025-04-15 · Far Cry 4
  > OK, so I managed to get it working. > > Install UbisoftConnectInstaller.exe as a non-steam game using Proton Experimental. > > Then launch the game again, and it correctly will launch Ubisoft Connect and load the game....