Windows 10: Screen Brightness Changes when Connecting External Monitor or Changing Display Settings on...

I posted this a while ago but no one answered, hence I will post it again!Hello everyone,Video links of issue:https://drive.google.com/file/d/17FR4ZdeHKRxp5tFdpOVnSBTAMG3Shump/view?usp=sharinghttps://drive.google.com/file/d/1f4g9KInXzW8ToQ4NkG9h17yXsGytCXYt/view?usp=sharingI own a Lenovo Legion 5 15ARH05H. I've had this issue for a while on Windows 11 and I had hoped that the issue would fix itself through the cumulative updates. Basically, my issue is the screen brightness on my computer changes whenever I connect an external monitor to it. This is extremely annoying because I frequently co

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Change screen brightness

Hi AhteshamHaq

Select Start , choose Settings , then select System > Display. Under Brightness and color, move the Change brightness slider to adjust the brightness. (If the slider isn't there, see the Notes section below.)

Change brightness slider

Some PCs can let Windows automatically adjust screen brightness based on the current lighting conditions. To find out if your PC supports this, in Display settings, under Brightness and color, look for the Change brightness automatically when lighting changes
check box, and then select it to use this feature. This automatic setting helps make sure your screen is readable wherever you go. Even if you use it, you can still move the Change brightness slider to fine-tune the brightness level.

Notes:

You might not see the Change brightness slider on desktop PCs that have an external monitor. To change the brightness on an external monitor, use the buttons on it.

If you don't have a desktop PC and the slider doesn't appear or work, try updating the display driver. In the search box on the taskbar, type Device Manager, and then select Device Manager from the list of results. In Device Manager, select Display adapters,
then select the display adapter. Press and hold (or right-click) the display adapter name, then select Update driver and follow the instructions.

 

changing monitor brightness

 

External monitor display settings

Hi,



Thank you for posting in Microsoft Community.



I understand that you are facing issues with the display scaling on your external displays. We will certainly look into this for you.

As you are using Vizio TV, you may have to try using custom resolution settings if the in-built settings do not provide the required settings.

For better clarity, please let us know:

• What is the version of Windows 10 that is currently installed on your computer? You can click on Search and type
  winver.
• Are you aware of any recent changes to the system, such as updates, after which you are facing this issue?
• What is the make and model of your computer?

Meanwhile, I would suggest you to check the steps mentioned in the Workaround section in

Windows scaling issues for high-DPI devices

I would also suggest you to check the Display drivers. Please refer

Troubleshoot external monitor connections in Windows 10

Set up dual monitors on Windows 10



Let us know how it goes.

Regards,

Vivian S