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Underscan slider missing in Display set

Underscan slider missing in Display setup window.  Screen does not fill the external monitor display and their are black borders around the screen. Using a MacBook 12 (early 2015) w/MacOS Sierra 10.12.5 and a HP Pavilion 32 Monitor at 1440P resolution.

I am connecting the HP monitor to the MacBook 12 via the USB-TypeC port adapter and an HDMI cable supplied by the Monitor (I have tried different HDMI cables and still have same issue - Underscan slider is missing and the screen does not fill the monitor).  The MacBook 12 does seem to correctly recognize the HP display and automatically goes to the correct resolution (1440P), however, there are Black borders (approx 1") around all 4 sides of the screen.

If I turn overscaning on the HP monitor's internal set-up, then the screen image goes beyond the monitor's edge and the menu bars are not visible because they over the edge of the display.  And I still don't see the Underscan slider in the Display set-up that would adjust and correct the image size to match the display size.

When I connect the same HP monitor to an older MacBook Air using the same HDMI cable but a Mini-Displayport to HDMI adapter, then every thing works.  The MacBook Air recognizes the HP monitor and the Underscan slider is available to adjust the screen image so that it fills the display perfectly.

I have tried mirroring and not-mirroring and still the MacBook 12 Underscan slider is missing in Display set-up window.

Any help will be appreciated.

Hi,

You shouldn't have to use underscan, and I don't know what they might have done with it in Sierra (I'm on El Capitan). Try clicking not the Scaled button and choosing the display's native resolution (1440 x 900?) or see if a different one works.

Thanks Tjk,

However, I am using "Default for Display" option and I have the same black borders on all 4 sides.  If I use "scaled" it is the same, no matter what resolution I choose there are black borders on all 4 sides.  But either way, it does seem that the HP is being recognized correctly as is the default resolution for the display which is 1,440 by 2,560 (1440 P) @ 60 Hz - except in both cases I have the same black bands on all 4 sides.

On the other had, if I use the older MacBook Air then the Underscan slider appears the Display setting window, and it lets me adjust the image size to fill the display completely. 

However, the MacBook 12 is missing the Underscan slider to make that adjustment.

I do appreciate any and all suggests - thanks!

Sorry I couldn't help. Perhaps someone else will stop by with a solution (or at least state whether or not they have the Underscan slider in Sierra).

Meanwhile, I would try resetting NVRAM, SMC, booting into Safe Mode, and creating a new admin user account to see if it works there. Who knows?

I do not recall the specific update which caused the disappearance of the underscan bar, though I think it has been two or three months - maybe more. I have really not found a solution using the macbook. Though, what I did was to go directly to my monitor's settings and change the display size. I believe your monitor will have a display size and ratio that fits your macbook's ones.

Though, I would very much like the undercan bar to return.

I am having the same problem! The underscan has disappeared and know I can't correct my HP display for my Mac Mini.

Yes, we do need to use under scan. I have an HP 2310 monitor. It interprets HDMI inputs as a television signal and applies overscan to the image, causing the outer edge of the display to be cut off. On MacOS, it means the dock and the menu bar are out of frame and you cannot see them.

This is why the under scan adjustment was crucial, and no amount of fiddling with the other options on the MacBook resolve the issue, and the monitor itself has no option to turn off the overscan setting.

So the option is to use my $2800 MacBook in a non-native setting to the display, or scale down to a lower display and have an enlarged black order all around the display. Neither option should be acceptable for the cost of this machine, especially considering the adjust was available before.

Facing similar issue, although the underscan/overscan slider was visible just a few months back on the same external display. Perhaps there should be away to request Apple to revert those changes with an update.

As a workaround, I am using SwitchResX application to manually adjust my display but it ll only work for next 10 days and I have no intention to spend extra bucks for a simple underscan/overscan issue while it can be a should be a part display setting...

最后更新：2017-08-25 23:34:30

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