Fixes for Forza Horizon 6: FH101 (CPU cores) or FH201/FH205 (GPU not supported) errors
If you're getting FH101 (CPU cores) or FH201/FH205 (GPU not supported) errors, here's how to bypass both on Linux.
How it works:
The game runs arbitrary hardware checks that have nothing to do with whether your machine can actually run it. The GPU check queries D3D12 feature levels and Enhanced Barriers support, both of which VKD3D-Proton can expose on Polaris via Mesa's Vulkan drivers. The CPU check just counts logical processors, Wine can be told to report more than you physically have by remapping existing cores.
4-core CPU + RX 500 series (e.g. RX 570/580):
WINE_CPU_TOPOLOGY=6:0,1,2,3,0,1 VKD3D_FEATURE_LEVEL=12_1 VKD3D_CONFIG=descriptor_heap,no_upload_h_vram,single_queue RADV_EXPERIMENTAL=heap,sync2 radv_wait_for_vm_map_updates=true %command%
6-core CPU + RX 500 series:
VKD3D_FEATURE_LEVEL=12_1 VKD3D_CONFIG=descriptor_heap,no_upload_h_vram,single_queue RADV_EXPERIMENTAL=heap,sync2 radv_wait_for_vm_map_updates=true %command%
Paste into Steam → right-click FH6 → Properties → Launch Options.
Tested: 720p, Minimun, 30-60fps, fully playable.
Why WINE_CPU_TOPOLOGY=6:0,1,2,3,0,1 works: Wine can't invent CPU indices that don't exist, so instead of 0,1,2,3,4,5 you repeat 0 and 1, Wine reports 6 logical processors, the game passes the check, real work still runs on your 4 cores.
Pictures on the game working on a I5-2400 (4 Cores), 16GB DDR3 and an RX570, take in consideration that my CPU its overclocked, so if you have this specific hardware your fps might be worse.
Hardware checks on games you can physically run are dumb. Period
Additional notes:
Kinda expected but the city part will make you drop your graphics settings and its highly demanding, expect to be playing at lower fps than the tutorial.
The game was trouble with non 60hz resolutions at least on my system, so i will recommend play the game on a 60hz mode, or at least not on 75hz thats where i had the issues with performance and visual glitches