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Could you please let us know the driver version you are running? Please go to Device Manger> Display adapters> Intel(R) HD Graphics right click on Properties and then go to Driver, you will be able to see the version installed.
As a recommendation please open the Intel® HD Graphics control panel, in the Display section look for the option called "Customize Aspect Ratio." Click on that and then horizontal and vertical sliders appear along the picture at right, try changing these parameters until the display fits the TV.
Let me know how it goes.
Thanks for the response. The graphics driver is Intel Iris Graphics 540 V 184.108.40.20634 10/7/16
I adjusted the sliders in the ‘Customize Aspect Ratio’ section per your suggestion. I didn’t fine tweak the sliders, but got the full screen image with both set at 60. I haven’t looked for distortion or other issues, but that did make the full screen available.
Let's update that version to the latest, then you should be able to find the sliders I mentioned. Below find the steps of the installation along with the driver.
Intel® HD Graphics driver .4664:
Instructions to install the driver:
Yes, it's the official way to correct for overscan (that's why it's there). No, there is no downside that I know of. Image distortion should only occur if you were using a completely different aspect ratio (for example, attempting to display a widescreen (16:9) signal on a standard (4:3) monitor will result in images being vertically distorted), but this is not the case here; you are only making fine adjustments.