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DELL U2413: seems to do underscan on the HDMI input: how to disable ?

I have hard times trying to control the slight overscan issue I have sending 1080i video from Avid Media Composer with Matrox MXO2 mini to my U2413 via HDMI.

The issue is that the image is clearly somewhat cropped on each side (and yes, only 1920 x 1080 pixels are used on the 1920 * 1200 monitor, as expected). I could not find a setting to enable/disable overscan in the U2413 (or force 1:1 pixel mapping, as should be the default with this standard 1080i or 1080p video)

Usually when there is an overscan/underscan issue, it is the monitor that is the culprit, and most monitors allow to choose between overscan or 1:1 pixel mapping (the latter avoids artefacts and distorsion due to picture  scaling)

Am I missing something ?


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