Windows 10: Microsoft windows 11, main monitor rescans randomly when secondary monitor is switched off

ok, I have a very peculiar issue. My main display is a Dell 4K monitor connected to a DisplayPort on NVidia 4090 and my secondary monitor is a Samsung tv QN95A connected to motherboard's HDMI and driven by the on chip INTEL gpu.I have set Dell as primary and Samsung as secondaryWhen both displays are ON, everything is fine. If I actually DISCONNECT the Samsung from the HDMI cable, everything is fine as well. BUT, when I have both of them plugged but the Samsung TV is switched off, the Dell monitor main monitor will randomly go into a brief video rescan, as if it is trying to reassess th

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How do you resize a secondary monitor for lining up?

Hello,Lemon Kluver

Thank you for reaching out with your question about resizing a secondary monitor in Windows 11. I understand the importance of having your monitors properly lined up for an optimal display experience. To provide you with the most accurate guidance, I'd like to gather some additional information:

1. Could you please clarify the specific issue you're facing with resizing the secondary monitor? Is it that the secondary monitor's resolution is not being detected correctly, or is it a positioning issue with aligning the monitors side by side?
   
2. Have you installed the latest graphics drivers for your system and monitor?
   
3. What type of connection are you using to connect the secondary monitor (e.g., HDMI, DisplayPort, VGA, etc.)?
   
4. Can you confirm the make and model of the secondary monitor?
   
5. Have you checked the display settings in Windows 11 to ensure they are correctly detecting and identifying the secondary monitor?
   

Additionally, please let me know if you have tried any specific troubleshooting steps or adjustments so far. Any details you can provide about the current setup, such as the resolution settings and how the monitors are currently positioned, will be helpful in understanding the issue.

Once I have this information, I'll be able to offer you more targeted instructions to properly resize and line up your secondary monitor in Windows 11.

Looking forward to your response so that I can assist you further.

Best regards,



Chandy |Microsoft Community Support Specialist

 

Windows randomly switching monitors.

I am having an issue where seemingly randomly, my monitors are switching monitor numbers or something similar. Any help would be much appreciated. Thank you.

Symptoms:
- Games open on a different monitor than the last time they opened.

- Streaming software suddenly is recording a different display than before.

- Monitors sometimes show the display name of a different monitor instead of their own. (i.e. 27GN7 instead of VG248)

- Maybe unrelated, but my desktop background also disappears randomly. This happens at different times than the main issue and will not reappear unless I restart the computer or reapply the background.

Details:

- No new monitors are attached or detached when this occurs. It seems to happen when awakening from being asleep or displays are turned on after they were turned off (by power settings).

- Potentially unrelated, but sometimes when it occurred, after waking up from sleep, it appears to zoom out (the entire desktop appears smaller on the screen and has a black border on all sides) before correcting the displayed image after .5-2 seconds.

- All monitors are the same resolution 1920x1080.

- Only started happening since I upgraded to Windows 11. Never had any issues for years of using Windows 10.

System Hardware:

- Windows 11 Home

- i5-12600k cpu

- EVGA rtx 3080 ti gpu

- PRIME Z690-A motherboard

- 64 GB RAM

- Monitor 1: LG 27GN750-B

- Monitor 2-3: VG248QE

 

Windows wrongly moved to primary monitor when switching on secondary monitor, and WM_DPICHANGED issues

First issue: When I switch my secondary monitor off, nothing changes (good).

However, when switching back on, all windows are moved to the primary monitor!!!

That's stupid. I would accept if that happend when switching off, but not when switching back on!!!

Secondary issue: The window moves to the primary monitor (WM_MOVE, but no WM_SIZING or WM_SIZE), and is followed by a WM_DPICHANGED message, which has the proper DPI values, but the window size is not changed accordingly!





2 = primary windows/desktop monitor

1 = extend desktop to this monitor

Test-App (which currently is fixed-size, but still supports resizing code to handle window resizing/rounding issues with WM_DPICHANGED)





Last before switching monitor off / window get's moved:
[22:46:41] [Debug] WM_MOVING 2222,635 size 840x637

After switching monitor off
[22:47:11] [Debug] WM_MOVE 223x272
[22:47:11] [Debug] WM_DPICHANGED
[22:47:11] [Debug] Old DPI: 1.75,1.75
[22:47:11] [Debug] New DPI: 1,1
[22:47:11] [Debug] Old Window @ 269,180 size 840x637
[22:47:11] [Debug] New Window @ 269,180 size 840x637
[22:47:11] [Debug] WM_MOVE 206x272
[22:47:11] [Debug] WM_SIZE 608x834