VKD3D-Proton 3.0 Released: AMD FSR 4 Anti-Lag Land in Proton – Works on Older GPUs Too!

A massive update just dropped for Linux gamers: VKD3D-Proton 3.0, the Vulkan-to-DirectX 12 translation layer powering Valve’s Proton. This release brings AMD FSR 4 upscaling, Anti-Lag, a complete shader backend rewrite, and tons of performance fixes — making DX12 Windows games run even better on Linux.

Quick explainer: VKD3D-Proton translates DirectX 12 (DX12) calls to Vulkan, letting you play modern Windows games seamlessly on Linux via Steam Proton or Lutris. Valve’s HansKristian-Work (lead dev) poured a year’s work into this.

Headline Features: FSR 4 & Anti-Lag Finally Here

• AMD FSR 4 Support: AMD’s latest AI upscaling tech (FidelityFX Super Resolution 4) now works in DX12 games on Linux.
  • Native: RDNA 4 GPUs (RX 9000 series) via Vulkan’s cooperative matrix & float8 shaders.
  • Experimental on Older GPUs: RDNA 2/3 (e.g., RX 6000/7000) via int8/float16 emulation — build from source, but expect perf hit & bugs.
• AMD Anti-Lag: Reduces input lag in supported DX12 titles — driver-exposed feature now works.
• No DLSS 4 Yet: NVIDIA’s rival upscaler unsupported natively; relies on per-game hacks.

DXBC Shader Backend Rewrite: Games Fixed, Perf Boosted

The big under-the-hood win: DXBC shaders (common in DX12) now use a shared frontend with DXVK — cleaner code, fewer bugs, better perf.

Other Key Upgrades & Experiments

• D3D12 Work Graphs (Experimental): Emulated via compute shaders — faster than native drivers in tests, but VRAM-hungry. Future-proof for upcoming games.
• Opacity Micromaps: Experimental RT feature exposure.
• Perf Opts: Texture batching overhaul, no manual clears on new AMD kernels, push descriptors on Qualcomm, bigger DGC scratch for Halo Infinite.
• Bug Squashes: 50+ fixes for crashes, deadlocks, rendering glitches across NVIDIA/AMD/Intel.

Proton Integration & How to Get It

Valve auto-includes this in upcoming Proton (e.g., Proton 10.x). For now:

• Easy Update: Follow this guide for Proton/GE-Proton.
• Download: GitHub Release

FSR 4 emulation? Build from source with flags — advanced users only.

Linux gaming just got a huge boost — especially for AMD users eyeing FSR 4. Proton keeps delivering! Test it out and report on ProtonDB.