8 Replies Latest reply: Mar 25, 2013 10:22 AM by ernstfromhaarlem
Tracy E Level 1 Level 1 (125 points)

I am looking for a way to disable a second monitor (plugged into the Display Port of a late 2010 iMac 27") without unplugging it. Does anyone know of a software solution?

 

When I am working I like that second monitor for desktop space, but other times (watching Netflix for example) the second monitor taxes the video card to much and degrades video playback performance. It would be great to have a software switch to ignore the second monitor. Right now, the only way I have found to do this is to unplug the display port cable.

  • 1. Re: Disable an External Monitor?
    captfred Level 7 Level 7 (26,235 points)

    Best to just turn the second monitor off with the power switch.

     

    Regards,

    Captfred

  • 2. Re: Disable an External Monitor?
    Tracy E Level 1 Level 1 (125 points)

    Power switch turns off monitor, but does not disable it from appearing active to the iMac (at least on my system). Should it? It is attached with a DVI cable to a display port adapter.

  • 3. Re: Disable an External Monitor?
    captfred Level 7 Level 7 (26,235 points)

    Interesting, same behavior with mine.   Although it still appears in system preferences, it knows it's not present as my menubar switches to the other screen.

  • 4. Re: Disable an External Monitor?
    Tracy E Level 1 Level 1 (125 points)

    I tried your test and got different results. My system did not become aware of the change at all like yours.

     

    I put the menu bar on the 2nd monitor and turned it off, but the system did not switch to the other screen.

  • 5. Re: Disable an External Monitor?
    X423424X Level 6 Level 6 (14,190 points)

    SwitchResX is precisely made for this.  Indeed it is the only OS X software I've seen made for just these kind of problems.  I use it to enable/disable my TV when I want to watch movies.  I highly recommend it.

  • 6. Re: Disable an External Monitor?
    Tracy E Level 1 Level 1 (125 points)

    Yes! Funny, I just found it and was coming back to the forum to post about it. It works well. It costs $19 USD, and seems well worth it.

     

    You can easily make Display Sets – predetermined configurations for monitor activation, resolution, etc. I quickly whipped up this menu to control all my monitors.

     

    monitor.jpg

  • 7. Re: Disable an External Monitor?
    X423424X Level 6 Level 6 (14,190 points)

    Yes, and if you notice in that picture, that SwitchResX has a provision to execute an applescript along with the switching.  I took advantage of that to allow me to move my audio between my mac and tv and also change the cursor size (hard to see that little bugger on the tv 7 feet away unless you make it bigger).

     

    It also allows you to move the menu bar (see main display) which I needed in a display set to move on to the tv since one site I use only supports full screen display on the screen containing the menu bar. 

     

    All-in-all a very nice utility.

  • 8. Re: Disable an External Monitor?
    ernstfromhaarlem Level 1 Level 1 (0 points)

    Searching for a lot of time.. very nice !!! Thanks