Windows 10: KB5060829 causes issues with Windows 11 Pro 24H2 when switching HDR mode on

Hi - I have noticed a lot of chatter regarding KB5060829 and HDR capability. I have had my Intel i7 8700 PC with HDMI 2.0a capability into an LG OLED65C7T TV with no issues for 7 years but noticed after the last Windows Update that trying to turn on the HDR setting with the switch in Settings > Display causes the screen to go blank as normal but instead of my TV showing me the HDR logo in the corner, screen brightness up, it returns the same screen, HDR stays off, and the switch stays in the off position. Re-installing new Intel GPU UHD 630 drivers did not work, and hence have discovered

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Factory reset Windows 11 24H2 (build 26100.863)

Hi, I am Dave, I will help you with this.

There are no currently listed problems resetting version 24H2 of Windows 11 and no specific steps you need to perform, are you experiencing any problems with that insider build that is causing you to perform a Windows reset?

 

HDR-capable monitor becomes completely unresponsive when switching between SDR and HDR under certain conditions

I have the Alienware AW3423DW in HDR Peak 1000 mode. Here are the steps to replicate the issue:

The relevant system information is as follows:

• Windows 10 version 21H2
  
• Nvidia GPU with GeForce Game Ready Driver version 528.02
  

1. Power on computer with HDR already enabled in Windows settings from previous session. The computer will start in SDR mode but will switch to HDR as soon as it reaches the lock screen.

2. Launch an application that does not natively support HDR but which runs in exclusive fullscreen (e.g. a non-HDR supported game).

3. Tab out of the game and switch off HDR in Windows settings.

4. Monitor switches off and is completely unresponsive, after a few seconds the Windows "device disconnected" sound effect can be heard.

5. At this point, the only way to restore the monitor is to unplug and replug the power cable of the monitor. Restarting the PC or unplugging and replugging the display cable does not work.

This is how I have manually recreated the issue, but the way it has happened to me most often is by simply alt-tabbing out of an application while running in HDR mode. If the application being tabbed out from is particularly resource-demanding and results in the monitor spending a long time switching between HDR and SDR, then it will completely fail and switch off, becoming unusable.

I have already tried reinstalling my graphics driver which did not help. How can I determine which component (i.e. Operating system, GPU, Monitor) is the point of failure that is causing this problem?

 

Unable to switch HDR colour on .

Unable to switch HDR colour on .. tower PC .. windows 10 pro regularly updated.. version 20H2 os build..19042.1288 monitor LG 55in tv resolution 4096x2160 (hdr compatible) On diplay settings page.. use HDR toggle switch is set to off.. (not greyed out).. When I click to on.. the screen goes black for 1 second then as the picture reappears.. I see the toggle switch back to off.. I have checked the DXDIAG log and HDR is ok.. (log attached) and in the registry (video settings) value 1 Any suggestions anyone? Thanks Konnie ..