Windows 10: Third monitor not working after update to 21H2

I recently installed the 21H2 update and now only two of my three monitors will work.

I’ve left it too late to rollback the update and have tried updating graphics drivers, changing the resolution etc but when I ‘extend’ to a third monitor it disconnects one of the others ‍♂️

If I plug the third monitor in while after boot up I can hear windows detects it but same carry on…it won’t work.

Anyone have a similar problem. I can’t find anything useful online and it’s more frustrating as it wasn’t a problem until I did the update.

submitted by /u/DukeOfDork11
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:)

 

Windows 10 Update - Now my dual monitors do not work

Hi,





One of the possible reasons why Windows 10 was unable to detect your dual monitor is an outdated or incompatible graphics driver. To best address your concern, we need you to answer the following questions:

• Which Windows 10 build are you using?
• Have you already tried performing the troubleshooting steps suggested by
  Mauro Cavallin on June 16, 2017?
• Are both of the monitors not working just like what the original poster was experiencing? If yes, have you tried disconnecting one of the monitors? What was the outcome?
• What troubleshooting steps have you done so far?

We will be waiting for your response.

 

I accidentally hit the update button instead of postpone and now my second monitor does not work.

Hello,

I suggest you to unplug the cable from the monitor and connect to the second monitor, and check if it works.

Also, suggest you to follow the below steps, and check if it helps.
1. Press Windows + X, and select Device manager.
2. Check if the second monitor is listed under Monitor.

Also, recommend you to refer below link answered by

KelvinNikkel , and check if it helps in resolving the issue.
http://answers.microsoft.com/en-us/...with-the/3b423a06-d4b1-4e2d-b170-38021f2412ad

Do let us know with the update of the issue.

Thank you.

 

Overclocking / Undervolting guide for Vega 56 or 64?

Here's a quick laundry list:

List of software to use for overclocking and testing
Examples:
Wattman (and how to find and use it, like an overview, including profiles)
Unigine Valley or Heaven (use this for quick testing while changing settings in Wattman and checking for stability / artifacts) ...just suggesting this
How to monitor cores / mem speeds and temps during testing (I've seen screen overlays, and others using GPUz)

Step-by step overclocking in Wattman
Fan speeds
Power limit
Temp limit
Voltages
Core speeds
Memory speeds