How to enable FSR 4.1.0 for RDNA3 in Alan Wake 2 (Linux)

Описание: Alan Wake 2, played in Linux, tested with FSR v4.1.0 and Frame Generation on an RDNA3 GPU through Optiscaler_0.9.0-pre10-RC3.

What you need to have and do to run the game in this way:
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Alan Wake 2 (Epic Games Store)
Heroic Games Launcher
In winecfg: Set Windows Version to Windows 11

ENVs:
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PROTON_FSR4_RDNA3_UPGRADE=1
PROTON_FSR4_INDICATOR=1 (only if you need the watermark to confirm the FSR version in use)
WINEDLLOVERRIDES="amdxcffx64=n,b"

Links:
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Download Optiscaler (0.9.0-xxx): https://github.com/optiscaler/OptiScaler
Download FSR 4.1.0 (leaked DLL, Feb 2026): https://gofile.io/d/BlXEYo

NOTE:
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If you are on RDNA2 or you just prefer FSR INT8 4.0.2:

1. Don't add amdxcffx64.dll in the game's directory
2. Don't use PROTON_FSR4_RDNA3_UPGRADE=1, PROTON_FSR4_INDICATOR=1, and WINEDLLOVERRIDES="amdxcffx64=n,b"
3. Download the FSR 4 INT8 DLL: https://gofile.io/d/fiyGuj
4. Copy the INT8 DLL over the amd_fidelityfx_upscaler_dx12.dll file that comes with Optiscaler

Games you'd like me to test:
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Pick a game you want me to test in Linux: https://tinyurl.com/cellfourteensgames

Chapters:
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0:00 Intro
0:28 Install Optiscaler + FSR 4.1.0
2:35 Game settings
3:15 Test FSR 4.1.0 (FP8 emu)
5:13 Enable FSR MLFG 4.0.0 (FP8 emu)
5:54 Gameplay with FSR 4 Quality + FG

OS details & PC specs:
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CachyOS x86_64
Linux kernel: 6.19.6-2-cachyos
Mesa: 26.0.1-arch2.3
Proton: cachyos-10.0.20260227-1
KDE Plasma: 6.6.2
KDE Frameworks: 6.23.0
Qt: 6.10.2
Graphics Platform: Wayland

GPU: Sapphire VGA Radeon RX 7800 XT Pulse 16 GB
CPU: AMD Ryzen 7 7800x3D
CPU Cooler: DeepCool AK620
MB: ASRock B650 Steel Legend WiFi
RAM: 32GB (2x16GB) DDR5 CL30 6000 Kingston Fury Beast
SSD: Samsung 980 PRO w/ Heatsink PCIe 4.0 NVMe SSD 1TB
PSU: 850W MSI MPG A850GF

Find me on social:
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Bluesky https://bsky.app/profile/cellfourteen...
Mastodon https://social.petertoushkov.eu/@cell...