Assassin's Creed Black Flag Resynced: The 3840x2160 Resolution Is Bugged! Who Else? (Workarounds)

How to fix it

1. Adjust NVIDIA scaling settings

   • Open the NVIDIA Control Panel.
   • Navigate to Display → Adjust desktop size and position (or the equivalent system‑display section).
   • Locate the Scaling option and set Scaling mode to GPU (or ensure the scaling device is set to the GPU).
   • Apply the changes and restart the game. This often removes the black bars and restores the correct aspect ratio.

2. Add your voice to the official bug report

   • Ubisoft has logged this issue as ACBFR‑3472 (borderless mode causing incorrect aspect ratio, letterboxing, and reduced viewport on some displays).
   • Visit the Ubisoft bug‑reporting page for Assassin’s Creed Black Flag Resynced and submit a report or up‑vote the existing entry. The more reports they receive, the higher the chance of a future patch.

If it still doesn't work

• The problem is a known bug with no confirmed fix yet; future updates may address it.
• Keep an eye on official patch notes or community forums for any new workarounds.
• Consider playing at a lower resolution (e.g., 2560×1440) where the issue does not appear.
• If you are using a non‑NVIDIA GPU, check the equivalent scaling settings in your graphics driver and set the scaling device to the GPU.

Note: These steps are based on current community findings and official bug tracking. No guaranteed solution exists at this time.