Solved Triple Monitors - Something Changed?


Pocah

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I have used triple monitors with Win 11 for a long time.

I will run A or B+C with the other(s) being switched off.

Monitor A is DP. Monitor B+C are DP and HDMI.

When A is on it is the primary monitor. When B+C are on, B is the primary monitor.

This has worked flawlessly with Win 11 since I first started using 11. but now something has changed.

Now, if I power up with monitor C off then everything is fine. But the moment I do anything that involves C being on, the trouble starts, in that Windows seems not to know when C is subsequently switched off. The problem with this is that Windows will often open apps on a monitor that is switched off. To make matters worse, Windows sometimes gets confused enough to put up the wrong size wallpaper on monitor A (monitor C is much smaller than monitor A).

This has changed in the last month or so. Does anyone know what has happened?

I suppose the answer would be to use a DP monitor instead of an HDMI for C, but it doesn't have a DP connection.
 
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My Computer

System One

  • OS
    Win 11
    Computer type
    PC/Desktop
    CPU
    12700
    Memory
    32gb
    Graphics Card(s)
    3070ti
    Sound Card
    -
    Screen Resolution
    3840x1600, 2560x1080

My Computers

System One System Two

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    ASUS ROG Strix
  • Operating System
    Windows 11
    Computer type
    Laptop
    Manufacturer/Model
    ASUS VivoBook
Thank you for the reply!
Yes, everything is as it should be.
At the moment I am considering buying a DP monitor or just living with the problem.
 

My Computer

System One

  • OS
    Win 11
    Computer type
    PC/Desktop
    CPU
    12700
    Memory
    32gb
    Graphics Card(s)
    3070ti
    Sound Card
    -
    Screen Resolution
    3840x1600, 2560x1080
Perhaps the most annoying thing is when Settings appears off-screen. You can't "Move" a settings window so the only thing to do is reboot the PC.
 

My Computer

System One

  • OS
    Win 11
    Computer type
    PC/Desktop
    CPU
    12700
    Memory
    32gb
    Graphics Card(s)
    3070ti
    Sound Card
    -
    Screen Resolution
    3840x1600, 2560x1080
the settings window will open on the same screen it was closed on.
 

My Computer

System One

  • OS
    Windows 11 Pro 64 bit 22H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    Gigabyte Z390 UD
    CPU
    Intel Core i7 77000 3.60
    Motherboard
    Gigabyte Z390 UD
    Memory
    16 GB
    Graphics Card(s)
    nVidia GEForce RTX 2060 Super
    Sound Card
    onboard
    Monitor(s) Displays
    Two 27" Dell 4K monitors
    Screen Resolution
    3840 x 2160
    Hard Drives
    M.2 NVME SSD, 500 GB; Two 2TB Mechanical HDD's
    PSU
    850w PSU
    Case
    Cyberpower PC
    Cooling
    Water cooled
    Keyboard
    Backlit Cyberpower gamiong keyboard
    Mouse
    Backlit Cyberpower gaming mouse
    Internet Speed
    1 GB mbps
    Browser
    Brave
    Antivirus
    Windows Security
The curious thing is that the settings reset to the primary display if Windows boots with all other displays off. But if you turn off an hdmi, it still goes to that screen if it was on it before. And unlike other apps, you can't "move" a settings screen from the taskbar. How odd.
The big mystery for me is why can windows tell if a DP monitor is switched off, but it can't tell if an hdmi is? It knows whether one is on or off at power-up, so why not all the time? Rhetorical questions, I suppose, since it's not about to change all of a sudden. But what has changed is the odd behavior of the wallpaper.
 

My Computer

System One

  • OS
    Win 11
    Computer type
    PC/Desktop
    CPU
    12700
    Memory
    32gb
    Graphics Card(s)
    3070ti
    Sound Card
    -
    Screen Resolution
    3840x1600, 2560x1080
In the Bios, the HDMI port is the default monitor input. It will always try to boot to that screen first.
 

My Computer

System One

  • OS
    Windows 11 Pro 64 bit 22H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    Gigabyte Z390 UD
    CPU
    Intel Core i7 77000 3.60
    Motherboard
    Gigabyte Z390 UD
    Memory
    16 GB
    Graphics Card(s)
    nVidia GEForce RTX 2060 Super
    Sound Card
    onboard
    Monitor(s) Displays
    Two 27" Dell 4K monitors
    Screen Resolution
    3840 x 2160
    Hard Drives
    M.2 NVME SSD, 500 GB; Two 2TB Mechanical HDD's
    PSU
    850w PSU
    Case
    Cyberpower PC
    Cooling
    Water cooled
    Keyboard
    Backlit Cyberpower gamiong keyboard
    Mouse
    Backlit Cyberpower gaming mouse
    Internet Speed
    1 GB mbps
    Browser
    Brave
    Antivirus
    Windows Security
I found it!!
Windows 11 remembers monitor configurations. So if you turn one off, then it adopts the remembered configuration for the ones that are on.
However, for reasons unknown, it managed to mess up. When I had B+C on and A off, it had B as the primary, but when I switched B+C off and A on, it set the primary to C!!! Of course it should have been A. So switching on C+A, I could access the settings and change the primary back to it's correct setting, A. Problems solved.
 

My Computer

System One

  • OS
    Win 11
    Computer type
    PC/Desktop
    CPU
    12700
    Memory
    32gb
    Graphics Card(s)
    3070ti
    Sound Card
    -
    Screen Resolution
    3840x1600, 2560x1080
I eventually managed to resolve all the problems with an additional app.
Windows was working OK, except when I went from B+C to A., Windows still thought that C was on.
Also, I have a long standing issue that I need all the taskbars to be identical and in Win 11 they are things missing on the secondary monitor.
I solved all of the remaining problems with with something called DisplayFusion.
It duplicated the taskbars, which was great, but unexpectedly it sorted the other problem too.
You can disable a monitor with it, so when A was on and windows mistakenly thought C was too, I disabled C using DisplayFusion.
The interesting thing is that if I switch to B+C, Display Fusion seems to recognise this is not the same situation and re-enables the monitor. It disables it again when I go back to just A powered on!!!
 

My Computer

System One

  • OS
    Win 11
    Computer type
    PC/Desktop
    CPU
    12700
    Memory
    32gb
    Graphics Card(s)
    3070ti
    Sound Card
    -
    Screen Resolution
    3840x1600, 2560x1080

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