Dear Debian Maintainers,

I'm experiencing a problem with HDR support in GNOME 48 on Debian 13
(trixie/sid). When I enable the HDR toggle in GNOME Settings under
Wayland, the screen immediately switches to HDR mode, but colors become
washed out, desaturated, and unnatural — clearly incorrect color rendering.

### Steps to reproduce:
1. Use a system with HDR-capable hardware.
2. Launch GNOME 48 on Wayland.
3. Go to Settings → Display.
4. Enable the HDR toggle.
5. Observe that colors appear washed out.

### Expected behavior:
Enabling HDR should enhance image quality and dynamic range, not degrade
color accuracy. Colors should remain vibrant and correctly mapped.

### Actual behavior:
After enabling HDR, the entire desktop appears faded and desaturated.
The monitor confirms HDR is active, but colors are wrong, suggesting a
color management or tone mapping issue.

### Hardware:
- **Laptop**: Lenovo Legion 7 16ARHA7
- **CPU**: AMD Ryzen 9 6900HX with Radeon Graphics
- **GPU**: AMD Radeon 680M (integrated) + AMD Radeon RX 6800M (discrete)
- **Memory**: 32 GiB
- **Display**: HDR-capable internal or external display
- **Firmware**: K9CN34WW

### Software:
- **OS**: Debian GNU/Linux trixie/sid
- **Kernel**: Linux 6.12.25-amd64
- **GNOME Version**: 48
- **Windowing System**: Wayland

Let me know if additional logs or screenshots are helpful.

Thank you for your work on Debian!

Best regards,
Dariusz