Compatibility Report

• Name of the game with compatibility issues: Saints Row: The Third Remastered
• Steam AppID of the game: 978300

System Information

• GPU: AMD Radeon RX 6900 XT (RADV NAVI21); also a Renoir iGPU present
• Video driver version: Mesa 26.2.4 (RADV)
• Kernel version: 7.2.8-2-cachyos
• Link to full system information report as Gist:(https://gist.github.com/alexugit123/9d6a03f7aa44dfd47b7bfc7443b63dc7)
• Proton version: GE-Proton11-7 (attached log). Same result on Proton Experimental experimental-11.0-20261001 and proton-cachyos-11.0-20261005.

I confirm:

• [ ] that I haven't found an existing compatibility report for this game.
• [ ] that I have checked whether there are updates for my system available.

Symptoms

The game's native HDR options never appear on Linux. In Options > Display only Brightness is shown. The HDR toggle and HDR Settings page are missing in windowed, borderless and fullscreen modes.

On Windows (same machine, same monitor, dual boot) the HDR rows are present whether or not Windows HDR is enabled. In windowed mode they are greyed out ("HDR: NO"), so they presumably need fullscreen. So the game does offer HDR on Windows; on Linux the rows are not even shown.

Findings from the attached log (gamescope with --hdr-enabled, DXVK debug logging on):

• Gamescope reports server hdr output enabled: true and hdr formats exposed to client: true.
• The game still creates an SDR swapchain: VK_FORMAT_R8G8B8A8_UNORM with VK_COLOR_SPACE_SRGB_NONLINEAR_KHR.
• For comparison, Red Dead Redemption 2 with the same gamescope options on the same system creates VK_FORMAT_A2B10G10R10_UNORM_PACK32 with VK_COLOR_SPACE_HDR10_ST2084_EXT.
• DXVK logs D3D11DXGIDevice::QueryInterface: Unknown interface query for 0ec870a6-5d7e-4c22-8cfc-5baae07616ed (the same warning appears in the RDR2 log, so it is probably unrelated).
• The game loads nvapi64.dll, which fails to initialize (no NVIDIA GPU) and is unloaded. No AGS library is loaded.
• Wine logs NtUserDisplayConfigGetDeviceInfo Unimplemented packet type 11 (4 times). I cannot tell whether these calls come from the game.

Earlier run on Proton Experimental with PROTON_ENABLE_WAYLAND=1 PROTON_ENABLE_HDR=1 DXVK_HDR=1 (Plasma Wayland session, variables confirmed in the game process environment): winex11.drv was still loaded and the swapchain was B8G8R8A8_UNORM / SRGB_NONLINEAR. Logs available on request.

Other things tried:

• HdrEnabled = true in display.ini (persists across launches, no effect). The Windows display.ini is identical.
• Multiple Proton versions (GE-Proton11-7, proton-cachyos, DW Proton, Proton Experimental).

I can't tell whether the cause is in Wine, DXVK or the game, so I am reporting the symptom and the comparison with RDR2.

Reproduction

1. System: CachyOS, KDE Plasma (Wayland session) with HDR enabled; primary monitor is a 1500-nit HDR display, 2560x1440 @ 240 Hz.
2. Set the launch options to: DXVK_LOG_LEVEL=debug PROTON_LOG=1 PROTON_ENABLE_AMD_AGS=1 ENABLE_GAMESCOPE_WSI=1 DXVK_HDR=1 gamescope -f -W 2560 -H 1440 -w 2560 -h 1440 -r 240 --hdr-enabled -- %command%
3. Launch the game and open Options > Display. Only Brightness is shown.
4. Quit from the menu and check $HOME/steam-978300.log: the swapchain is SDR even though gamescope exposes HDR formats.
5. Same launch options on RDR2 (AppID 1174180) produce an HDR10 swapchain and working in-game HDR.

Attached: steam-978300.log (compressed, DXVK debug level).

steam-978300.log