For what it’s worth, it works on one of my two PCs. But yeah. Clearly not finished.

If I were you I’d try to change every possible Windows display option I can on every possible monitor and change them back, in each possible combination of monitors plugged in/out.

There’s a possibility there’s an option that seems like it’s set one way but it’s actually not. It happens sometimes with Windows version changes.

I think you’re mostly dealing with the consequences of DisplayPort monitors being considered disconnected entirely when off. I tried a display dummy adapter once, and it wouldn’t go above 1080p, plus it didn’t completely solve the issue.

It’s really not an easy problem to solve. Using only HDMI all the time technically works, but very few computers offer more than 1 HDMI port.

A few ideas:

• Have you tried checking or unchecking the checkbox “Remember window locations based on monitor connections”?
• maybe this is the result of Windows putting all your windows on a screen with weird settings when the main one is off. Is this a laptop whose main screen you’re not using for example? Is there anything else that could be considered a “monitor” on this machine? (Including any sort of software-based thing that would connect virtual monitors)? Maybe there IS something at a weird display resolution or scaling but it’s hard to notice what.
• Disconnect the monitor manually and reconnect it. Is the issue the same? If not, the monitor itself may be doing weird things when the system tells it to go to standby.

Edit: Ugh didn’t notice the below wasn’t an option at first

There’s a relatively easy workaround to SOME of it: disable the screen turning off after X minutes of inactivity, and replace that with a screensaver that’s a black screen.

The screen will always be “on” , even though it won’t be displaying anything, which will prevent your windows from being messed with when your PC times out due to inactivity.

But if your PC goes to sleep or you turn a monitor off, it won’t help you.

They will truly do anything not to admit the problem is cars