README

This script automates the process of switching your primary monitor with a dummy monitor using MultiMonitorTool.
This is useful for users of Sunshine (a screen sharing software) who experience issues with sharing their primary monitor.

Caveats:

If using Windows 11, you'll need to set the default terminal to Windows Console Host as there is currently a bug in Windows Terminal that prevents hidden consoles from working properly.
- That can be changed at Settings > System > For Developers > Terminal [Let Windows decide] >> (change to) >> Terminal [Windows Console Host]
- On older versions of Windows 11 it can be found at: Settings > Privacy & security > Security > For developers > Terminal [Let Windows decide] >> (change to) >> Terminal [Windows Console Host]
The script will stop working if you move the folder, simply reinstall it to resolve that issue.
Due to Windows API restrictions, this script does not work on cold reboots (hard crashes or shutdowns of your computer).
- If you're cold booting, simply sign into the computer using the "Desktop" app on Moonlight, then end the stream, then start it again.
In the Sunshine WEB UI, make sure you leave the Output Name blank under the Audio/Video tab, otherwise it could cause breaking behavior with this script.

REQUIREMENTS

For GFE users

This script no longer supports GFE, but you are able to retrieve a legacy version of this script that does support it: https://github.com/Nonary/MonitorSwapAutomation/releases/tag/legacy

For Sunshine users

Version 0.19.1 or higher
Host must be Windows

INSTRUCTIONS

Open up MultiMonitorTool and click on File -> Save Monitors Configuration and save it in the current folder this script is located in with the name of primary.cfg.
Repeat the same steps of step 1, except save it with the name of dummy.cfg.

Open up the dummy.cfg file and set every parameter related to your primary monitor's position, refresh rate, etc. to 0. For example:

 Name=\\.\DISPLAY1
 MonitorID=MONITOR\GSMC0C8\{4d36e96e-e325-11ce-bfc1-08002be10318}\0009
 SerialNumber=LGTV
 BitsPerPixel=0
 Width=0
 Height=0
 DisplayFlags=0
 DisplayFrequency=0
 DisplayOrientation=0
 PositionX=0
 
 Name=\\.\DISPLAY11
 MonitorID=MONITOR\XMD29831\{4d36e96e-e325-11ce-bfc1-08002be10318}\0007
 SerialNumber=DUMMY
 BitsPerPixel=32
 Width=3840
 Height=2160
 DisplayFlags=0
 DisplayFrequency=120
 DisplayOrientation=0
 PositionX=0

In the example above, every numerical value has been set to 0, which lets the script know that the display should be turned off.
Also take note in the example, that my dummy display should have values configured to let it know that it should be turned on.

Verify that the dummy.cfg file has only one display that contains values for the BitsPerPixel, Width, Height, and so on.
4a. For the primary.cfg file, it does not matter if there are other displays enabled, but you would want to make sure your dummy is "zeroed out" so you don't end up with an invisible monitor.
Basically, primary will "zero out" the dummy plug, and dummy will "zero out" the main display. This will automatically transfer games and windows back to the primary monitor if setup this way.
In the dummy.cfg file, locate your dummy MonitorId and copy and paste it to the dummyMonitorId key in the settings.json file. Make sure to escape the backslashes.

Validate you have escaped the backslashes, below is an example of a valid settings.json file.

{
"startDelay": 2,
"gracePeriod": 60,
"configSaveLocation": "%TEMP%",
"dummyMonitorId": "MONITOR\\XMD009A\\{4d36e96e-e325-11ce-bfc1-08002be10318}\\0010"
}

Install the script by double clicking the Install.bat file, you may get a smart-screen warning... this is normal.
You will be prompted for administrator rights, as modifying Sunshine configuration will require admin rights in the coming future.
If there are no error messages presented on the screen, the script successfully installed and you can close the terminal.

The paths referenced above will vary on your machine.

TROUBLESHOOTING

If you encounter issues with the script, you can try the following:

Monitor is not swapping before stream or afterwards

Check that your dummy monitor MonitorId matches the value in the dummyMonitorId variable in the settings.json file.
Check that you have escaped the backslashes for dummyMonitorId in the settings.json file.
Valid: MONITOR\\GSMC0C8\\{4d36e96e-e325-11ce-bfc1-08002be10318}\\0009
Invalid: MONITOR\GSMC0C8{4d36e96e-e325-11ce-bfc1-08002be10318}\0009
Check that you have set every parameter related to the primary monitor's resolution in the dummy.cfg file to 0.
Check that you have set every parameter related to the dummy monitor's resolution in the primary.cfg file to 0.
Check that you have at least one monitor not "zeroed out" in both the primary.cfg and dummy.cfg files.
Ensure that you have followed the requirements for Sunshine users as listed above.
Increase the startDelay in the settings file if you're experiencing the script only works intermitently.
If you are still experiencing issues, try uninstalling and installing it again.

ResolutionAutomation script isn't changing my resolution after connecting and or is intermittently working

First, ensure that MonitorSwapper is installed first, then install the ResolutionAutomation script.
- If you installed them out of order, uninstall both, then install MonitorSwapper, then ResolutionAutomation.
Adjust the start delay in the settings.json file to 3 or 4 seconds and that should resolve that issue.
- Sometimes the swap can take longer to do and the resolution swap is happening on your primary screen
- Adjusting the start delay will give the swap more time to complete, thus making sure resolution is changed on the correct monitor.

Only one screen is being restored, everything else works

You will have to do this workaround mentioned here: #9
- There is currently a bug in the MultiMonitor tool in some scenarios with people who have dual screens. I do not have the source code for that tool, so it is impossible for me to fix directly, a workaround has to be done until resolved by Nirsoft. Please report your issue to nirsofer@yahoo.com so he can gather more users and data to ultimately resolve this issue.

Resolution Change when resuming or starting new stream

Double check and make sure you have put the correct "dummyMonitorId" in the settings.json file, that way the script doesn't attempt to restore monitor profiles that are already active.

Change Log

v1.1.7

File Lock Fixes: Reduced the frequency of issues that caused file lockouts during the parsing of monitor configurations.
Improved Profile Restore: Enhanced the validation logic to ensure all monitor IDs match, thereby reducing the occurrence of false positives.

v1.1.6

Logging Fix: Fixed an issue where the log file wasn't created if a new stream started before the monitor was restored from the previous session.
Code Update: Updated the script to use the SunshineScript Installer template, simplifying the maintenance of the installation process for all projects.

v1.1.5

Black Screen Issue Fix: Addressed an issue caused by a bug in the Windows Display API that could result in games streaming as a black screen or freezing after menu interactions.
Code Cleanup: Refactored the script to improve performance and removed unnecessary code.

v1.1.4

Monitor Restoration Fix: Corrected a premature script exit that occurred before the monitor could be restored, resolving issue #31.

v1.1.3

Monitor Configuration Stability Fix: Solved a problem where monitor configurations could incorrectly change under specific conditions, such as when a stream was suspended and then resumed without completing the monitor restoration process from a previous session. This issue stemmed from an unexpected behavior in Windows' display settings API, which applied changes even when a monitor swap failed. The fix prevents the script from attempting to restore the primary monitor during streaming sessions, avoiding changes in host resolution.

Nonary/MonitorSwapAutomation 1.1.7 v1.1.7 on GitHub