Windows 10: External Monitor appearing fuzzy

Hi!I am using an windows 11 HP laptop with an external LG monitor. I always use the external display with my laptop with the help of a HDMI cable and turning off the main display monitor of the laptop. Recently I was reading a pdf on an app called Sioyek and I entered Fullscreen mode which made the entire monitor display fuzzy. I tried changing the HDMI cable, cleaning the ports but it didn't work but this problem doesn't happen on the laptop screen it only happens when I choose the Second Screen Only option from the project screen menu. Also if I choose the extend or duplicate screen option t

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External monitor is blurry

Hi,

The blurry display when using an external display may indicate a scaling issue. If the display of the internal monitor is not compatible with the external monitor, it may render a poor or fuzzy display. As an initial step, we suggest that you try the methods
under the Workaround section provided on this
support article.

Let us know should you need further assistance.

 

Fuzzy/Blurry letters on external display (DPI scaling issue?)

Hello -

Relevant data

• Microsoft Surface Book - i5 - 256 GB with NVIDIA GeForce GT 940M
• LG 34UM58-P - Ultrawide IPS Monitor (Also tried on an acer HD monitor)
• High quality mini display to HDMI cable
• Windows 10 Pro 1709
• Surface Book just freshly set up

Description

• In essence, all text (not only in browsers, but also in generic windows menus, see images below) are slightly fuzzy - while being tack sharp on the Surface Book display.
• Based on my search on this forum and the wider web, this is a known issue, but none of the solutions or workaround suggested have worked for me. ( Been spending a full day and a half on researching this and I think I tried them all)

Display settings Settings

• On Surface Book: Dropbox - File Deleted
• On LG ultrawide: Dropbox - File Deleted

Illustrative images/screenshots

• Fuzzy text on windows start menu on external monitor:Dropbox - File Deleted
• Fuzzy text on the menu of this forum on external monitor:Dropbox - File Deleted
• For reference the same menu on the display of Surface Book:Dropbox - File Deleted

I believe this is a known bug in Windows 10, where it can not correctly handle 2 monitors with different DPI scaling. The posts on this forum suggest that the latest versions of Windows should have fixed this issue, but for me this is not the case - as I
am indeed running the latest version of Windows 10

(I also posted this in the Surface forum, but since this appears to be a Windows issue and not a Surface one, I thought I would try my luck here. Apologies for the cross post.)

Any advise greatly appreciated.

 

Laptop suddenly stopped recognizing the external monitor

Hi,

Thank you for posting your query in Microsoft Community.

To assist you better, I would like to ask if the laptop is unable to recognize only the external monitor or other external devices also.

I suggest you to run the Hardware and Devices troubleshooter by following the steps below:

• Click on the Start button, and type “Troubleshooting” on the search bar.
• Click on “Hardware and Devices”.
• A pop-up will appear, click on the “Next” button and your hardware troubleshooting will start.
  

Hope the information is helpful. Keep us posted on the status for further assistance.