Dolby Vision on Windows with an LG B3?

A new Windows 11 update forced Dolby Vision on, which turned the screen completely green. It was fixed by pressing Win + Alt + B (Windows HDR toggle shortcut)

🛠️ Temporary Fix (for Forced Dolby Vision Toggle On):

If Dolby Vision is stuck on or can't be disabled in Windows 11 (especially after Insider updates), use this quick workaround to regain control and re-enable HDR10 instead:

🔧 Steps:

1. Change resolution to 4096×2160. Now DV will work but aspect ratio is off.
2. Enable HDR in Display Settings.
   • Go to Settings → System → Display → HDR
   • Turn “Use HDR” to On
   • Now you should be able to disable Dolby Vision manually
3. Switch back to 3840×2160 @ 120Hz. You’ll now be running in HDR10 mode

*Updates

1. Dolby Vision Extension Package Installation
To enable Dolby Vision (DV) support, install the DV extension package from the Microsoft Store:
🔗 https://apps.microsoft.com/detail/9PLTG1LWPHLF?hl=es-es&gl=CL&ocid=pdpshare

2. Working Dolby Vision on Some TVs (Beta Channel - Build 26120.4250 / KB5060820)
Some users have reported success with Dolby Vision on specific TVs using Windows 11 Insider Beta Channel build 26120.4250 (KB5060820).

"Beneficial for LG C2 TV: We fixed the issue where you might see severe discoloration when connecting your PC to some older Dolby Vision displays."

3. Official Windows 11 24H2 Release – Build 26100.4349 (KB5060842)
This build has been released as part of the 24H2 official rollout and may bring improvements for DV and display support.

4. Unlock Dolby Vision on Older LG OLEDs Using OLED Control
A useful community guide has been shared on Reddit for unlocking Dolby Vision support on older LG OLED models using third-party tools:
🔗 Reddit Thread: Unlock PC Dolby Vision on Older LG OLEDs

5. Github link: https://github.com/balu100/dolby-vision-for-windows

6. Microsoft forum: https://answers.microsoft.com/en-us/insider/forum/all/the-hdr-dolby-vision-mode-switch-in-262005581-was/453aafb2-bb7d-4a43-81aa-1088c4c02f13

7. 4096x2160 is a DCI 4K resolution. It bypasses Dolby Vision restrictions, likely by:

• Using a different input pipeline
• Allowing RGB at full fidelity
• Treating the PC like a workstation or cinema source
• lack of Dolby filtering

🧪 Working 4096x2160 Setup:

• 🖥️GPU: RTX 5070 Ti (HDMI 2.1, Driver 576.52)
• 💻Windows: 11 24H2, Build 26100.4351
• 📺****TV: LG B3 OLED (Firmware v23.22.02, Dolby Vision 22.11)
• 💡Dolby Vision Extension: Installed from the Microsoft Store

🛠️Working Settings:

• Resolution: 4096×2160
• Refresh Rate: 120Hz
• Color Format: RGB 4:4:4
• Bit Depth: 12-bit
• Dynamic Range: Full
• HDR: Enabled in Windows
• Dolby Vision: TV switches to DV mode with no issues

Confirmed via EDID (binary attached)

📎 https://drive.google.com/file/d/1jxlcmJTsDFnvR9HuRQqmBQMDbFYtZoGD/view?usp=drive_link

• TMDS Clock: 600 MHz
• Deep Color Support: 10/12-bit RGB
• HDMI Forum VSDB extension present
• DV not explicitly filtered for RGB