Disabling a monitor will have side-effects on other monitor's background image

[and-rea]

Hello, I have this current setup:

• MacOS 10.11.5
• iMac (21.5-inch, Late 2009)
• secondary monitor (BenQ GW2765) attached by DisplayPort and set as primary

When I disable the iMac monitor, the wallpaper on the BenQ screen will grey out from the top left for 1920x1080 pixels (the resolution of iMac monitor) and to restore it I need to change resolution two times, the first will fix the issue, and the second to put it back to the resolution I need.

[and-rea]

This issue seems the same as #55 but on background images rather than screen savers.

[nadesco]

Possible fix;
Disable the "Displays have separate Spaces" option in Mission Control settings. This resolved the overlapping wallpaper problem for me but you'll need to reboot for it to take effect.

(From Lju88's comment and flapane's confirmation in thread 10.)

[lilipeipei]

Disabling "Displays have separate Spaces" also will disable Split View.

Ref: https://support.apple.com/en-us/HT204948

[and-rea]

As long as I don't (actually) use split view, that's a good workaround for me :)
At least, until the issue has been fixed.

[zacharyrs]

Hey, I don't know why but I don't seem to have this issue anymore.

When I first started using this on my 'mac' (hackintosh), I faced the same problem. The above suggestion to disable separate spaces worked, but I used them so I quickly reverted that.

Since then the only change I've made is I use the command line rather than the app, with an automated script to disable the monitor.

I had to use the script as my GPU wasn't supported initially, and so I had to boot with the internal one, which left me with a phantom monitor.

Well, basically I think the command line might not face the issue? I'm not sure.

Hope someone has an idea,
Zach