Display on an HP 23fi monitor with a MacBook Pro
I just bought one and had the same problem - blurry fonts on 2014 RMBP &amp; had to adjust the underscan to fit the image on the screen.

Fixed by


turning off Overscan in the monitor menu Image Control &gt; Custom Scaling &gt; Overscan &gt; Off and
turning off Underscan in the System Preferences &gt; Display menu.