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Hello,
I have a mac mini with new Dell P2715Q monitor. The mac mini has always under scanned, leaving a 3/4" black window box around the screen. Is there any way to fix the under scan issue in OS X v 10.11.4? The under scan slider is gone and I have no way to manually adjust the screen. Both the monitor and display preferences are set to automatic. Any manual changes to either do not eliminate the window box. Thank you!
Mac mini, OS X El Capitan (10.11.4)
What year model is your Mac Mini....?
(use Apple > About This Mac)
What connection are you using...?
(Mini DisplayPort to Display Port or HDMI)
Also check out > OS X El Capitan: Display pane of Displays preferences
model is Late 2014
Connection is mini DP to DP.
I've worked through the various scaled resolutions in System Preferences - Display - Scaled (while holding alt/option), to no avail.
What Resolutions and Refresh Rates are listed in the display preference...?
To get the fully 3840 x 2160 resolution for that monitor, I'm pretty sure that you will need to lower the Refresh Rate down to 30Hz.
The over/under scan slider is for HDMI connection only.
Can you post a screenshot of the options available in display preferences?
It is 30hz, which is the default unless I force a change to one of the non-default scaled resolutions.
I know this isn't a true cmd-shift-4 screen grab, but I also wanted to show the unused screen area due to the under scan. This morning I changed the cable from mini-DP/DP to HDMI in the hopes of getting the scale slider to fix this issue. As you can see from the picture, whether I am using an HDMI cable or a display port cable, I am still loosing usable screen due to consistent under scan.
Something is not right in your Display Preferences. It should display what resolutions are available in scaled and also show what the refresh rate is. See my Pref. Perhaps there is some other setting available in the Monitor for display.
There is nothing wrong with his display preferences. What the posted is what is display for high resolution monitors. To show what you show canderson42 has to press and hold the Option key and then click on the Scaled line item. canderson42 also has to check the box on that window that says Show low resolution modes to show refresh rate,
Also, canderson42 please take a screenshot
How to take a screenshot on your Mac - Apple Support
of the screen vice take a photo of the scree.
Does the Display Pref window appear like that only when the highest resolution supported is selected? My monitor supports 3440 X 1440 but my MacMini(Late 2012)only goes as high as 2560 X 1440.
Another possibility according to the manual if the aspect ratio is incorrect the image will appear centered but not fill the screen.
No. here is my Dell 4K when at 1920x1080
mac mini with intel iris underscan
