HDR no longer working in Forza Horizon 6

Issues & Assistance
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1

HDR regression on RX 9070 XT after updating from linux-cachyos 7.0.12 to 7.1.1.

KDE Plasma 6.7 still detects HDR correctly and desktop HDR works, but Forza Horizon 6 under Proton reports “No HDR display detected”.

Booting into linux-cachyos-lts 6.18.36 immediately restores HDR functionality in the game with no other changes.

I don’t have any other games with HDR support currently installed, so I haven’t tested any other games. (Please note that I used ChatGPT to troubleshoot and it generated the ‘report’ seen above).

2

Workaround by setting Color accuracy to “Prefer color accuracy”, instead of “Prefer efficiency”.