Hello everyone,

I want to report a reproducible UI/driver behavior related to FSR4 AI upscaling and other Radeon features in a hybrid GPU setup (AMD + NVIDIA).
This is not about frame generation, but specifically about FSR upscaling and Radeon feature availability.

System setup

• Dual-GPU system
  • AMD GPU → used for rendering the game and enabling FSR4 / Radeon features
  • NVIDIA GPU → used only for Lossless Scaling–based frame generation
• Single monitor
• Monitor frequently switched between GPUs
• Windows 11
• Latest AMD Adrenalin driver
• Game tested: Warhammer 40K: Space Marine 2

Observed behavior

1. When the monitor is connected to the NVIDIA GPU:

• Under the Game tab in AMD Adrenalin, most Radeon features (including FSR4) appear unavailable or disabled
• It looks as if FSR4 cannot be used

2. When the monitor is connected to the AMD GPU:
   • FSR4 and other Radeon features become available
   • I can enable FSR4 AI upscaling in-game
   • The game requests a restart (expected)
3. Key discovery
   • After enabling FSR4 once while the display is connected to AMD
   • I fully close the game
   • Switch the monitor back to the NVIDIA GPU
   • Relaunch the game

👉 FSR4 AI upscaling is still fully active and working, even though:

• AMD Adrenalin UI no longer shows it as enabled
• The Game tab implies the feature is unavailable

This was verified by:

• Correct internal resolution scaling behavior
• No double-upscaling blur
• Stable image quality compared to native rendering

Why this is confusing

From the user’s perspective:

• Adrenalin suggests FSR4 is disabled or unsupported
• In reality, the feature is already enabled and running correctly at runtime
• This makes it look like FSR4 is broken in hybrid setups, when it is not

Why this appears to be a driver/UI issue

• FSR4 state is clearly written to the game’s configuration and respected at runtime
• Feature availability in Adrenalin seems tied to active display routing, not the actual rendering path
• The UI does not reflect the true active state of Radeon features

Suggestion

It would greatly improve clarity if Adrenalin could:

• Reflect the actual runtime state of FSR4 and other Radeon features or
• Display a warning such as:“Radeon features are active, but the display is not currently connected to this GPU.”

This would prevent confusion and unnecessary troubleshooting in hybrid GPU setups.

Thanks for reading.
I’m happy to provide configs, logs, or additional test results if needed.