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high sierra overscan issue

posted on this a few days ago, no support/fix


found another post with multiple reports on this issue dating back to october 2 and yet NO posts on a fix


(The specified item was not found.


so, fresh post... anyone have a fix for those of us who have NEVER had an issue with overscanning on macs before the 10.13.1 update?


(10.13.1 on mac mini (late 2014))

Mac mini, macOS High Sierra (10.13.1)

Posted on Nov 12, 2017 5:35 PM

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Question marked as Best answer

The same overscan issue occured after installing High Sierra update when using a Mac mini set up and a HP 23xi monitor. I've found the solution is to use the HP monitor controls (the bottom right buttons found on the monitor itself). Go into menus and find Image Control then Custom Scaling to switch the Overscan control from Auto to Off.

There doesn't seem to be a solution to be found from within the Apple software though a workaround is to go to Settings each time you logon, then to Resolution and select Scaled. Then select 1600 x 900 (which corrects the dimensions) and then select 1080p.

While this works for HP23xi and Mac mini (2012) it may be different for other monitor set ups, but if possible try addressing the display problem through the monitor's own controls and not the Apple software.

Posted on Jul 30, 2018 12:23 PM

16 replies

Feb 27, 2018 5:16 PM in response to LidiaG

Same issue. Using MacBook Air with Viewsonic VX2433 external monitor in mirror mode. Was working fine for the past several year, then when I upgraded to High Sierra started periodic overscan on Viewsonic monitor. Connecting via HDMI cable through a Thunderbolt hub. Whenever the Mac goes to sleep, or is turned off, or disconnected from monitor then reconnected, it seems to reset the Viewsonic to AV mode instead of PC mode. Can manually reset, but end up doing this several times a day. Called Viewsonic tech support; they determined it's not the monitor, suggested an issue with OSX High Sierra. Just installed OSX 10.13.3, so most current software. No change. Hope Apple makes note of this and can issue a fix.

high sierra overscan issue

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