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The Underscan slider no longer appears after up...

Last year I hooked up my 11" MacBook Air (2015) to a ViewSonic 27" VX2753 monitor. The Air was running 10.12.2 or 10.12.3 at the time. The image was overscanned (the menu bar and dock were cut off), but in the Displays preference pane, the Underscan slider allowed me to adjust the monitor in mirror mode so that everything fit. After upgrading to 10.12.4, the monitor was reset and the Underscan slider no longer appears in the preference pane. Nothing I do will get the Mac's display to fit on the monitor. The controls on the monitor itself are grayed out. I am using a mini-DisplayPort to HDMI cable that supports the latest (1.4) version of HDMI and supports 4K, so it should easily be able to handle a 1080p display. How can I get the Underscan slider to appear?

Someone found the answer for me. It is necessary to change the input selection of the monitor from HDMI-AV to HDMI-PC. Then the monitor mirrors the MacBook Air screen perfectly.

About overscan and underscan on your Mac, Apple TV, or other display - Apple Support

Thank you for the link. That page was helpful in explaining the general function, but it was last updated in June, 2016 and does not explain why the underscan slider was available in 10.12.3 but is not available in 10.12.4. Was there an intentional change to this feature in 10.12.4. Or is it a bug introduced with that release that would hopefully get fixed in 10.12.5?

Someone found the answer for me. It is necessary to change the input selection of the monitor from HDMI-AV to HDMI-PC. Then the monitor mirrors the MacBook Air screen perfectly.

Thanks for updating your post Larry!

But, follow on question... how do you "change the input selection of the monitor from HDMI-AV to HDMI-PC"? I do not see that anywhere in my available menus, nor in searching on-line for instructions. Thanks!

Update - I found the settings on my monitor itself that I could turn off the overscan that was set to automatic. I am guessing that I was using the previous display setting overscan/underscan slider to compensate for the monitor setting. Everything looks good now.

We found a fix that worked for our computer. We have a mac mini running Mac OS Sierra 10.12.5. Prior to upgrading to Sierra we had no issues whatsoever using our mac mini with an older TV as the monitor. When we upgraded the OS to Sierra 10.12.4, the overscan was unresolvable because the bar allowing you to control this in the Display settings went away. To fix the issue, we unplugged the HDMI cable connecting the monitor (an older TV) to the mac mini. We had an adapter that converts the HDMI cable to the Mini Display Port fitting. We had previously purchased this adapter from Apple some years ago. We then plugged the monitor (the older TV) back into the mac mini via the Mini Display Port. This is how we resolved our issue. However, we remain infinitely frustrated at Apple for TAKING AWAY a useful feature in an OS upgrade.

I have this problem to.  There is no option for me to change these settings on the monitor. Any ideas?

I was really hopeful this solution would work for me.  Alas, no luck so far.  Frustrated.

最後更新：2017-09-22 11:21:25

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