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Windows uses Generic non-PnP monitor settings on boot-up

Posted on 2018-02-09
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Last Modified: 2018-02-17
I have two computers at my desk. I switch between them using a KVM switch and a single keyboard, monitor, and mouse. If I power up my second computer (a Win7 machine) when I'm not switched to it, the display starts up using "Generic non-PnP monitor" and a very low resolution. I have to go to Control Panel, Display, Adjust Resolution, then click on Detect, at which point the computer recognizes the monitor (Acer G235H) and resets the resolution appropriately.

Is there any way to lock in the monitor setting so that it will always assume the correct monitor and keep the resolution I usually use?
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Question by:ElrondCT
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by:nobus
ID: 42464434
how is it connected?  vga or HDMI?  
your switch may not support that - test with another monitor, or switch
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by:ElrondCT
ID: 42465593
The connection is VGA.

As far as I can tell, the problem is that Windows isn't getting any response from the monitor when it starts up, so it's defaulting to a Generic monitor type. I'm asking if there's some way to tell Windows to assume that the monitor is an Acer G235H even without the monitor being connected. So the switch really shouldn't matter.
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by:nobus
ID: 42465821
normally, windows only recognises connected devices
you could try devcon rescan command :  https://docs.microsoft.com/en-us/windows-hardware/drivers/devtest/devcon-rescan
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by:ElrondCT
Devcon doesn't seem useful to my situation. It's intended for device developers, and is only available if you've installed the Windows Developer's Kit (which I have not).

So it looks like the answer to my question is that there's no way to lock the monitor setting; it's always based on a response from the device, and if no device is plugged in, it always sets it to Generic with a low resolution. I have to reset once the monitor is connected to the system.
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by:nobus
then why not install the Kit? then at least you can test it
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