External display has blurry fonts on Dell U2312hm- MacBook Pro Retina I just bought a new Dell external display (U2312hm) for my MacBook Pro Retina.

The fonts appear to be very blurry. I've searched and found a solution here, but it didn't fix my problem. I ran the script supplied in the thread, followed all instructions and the problem remains (tried on 2 different rMBPs with 2 different U2312hm monitors).

here are real a few examples (the upper browser in each picture is chrome on VMware and the lower is chrome on OSX 10.8.5):



I tried different font smoothing configurations which failed to improve the problem.
I tried using Apple's MiniDisplayPort to AVI and MiniDisplayPort to DisplayPort cables - no change.

What can I do?
The solution at http://embdev.net/topic/284710 worked for me.

Attach your display, download the updated patch-edid.rb, run ruby patch-edid.rb in Terminal and reboot.  Voila!

Tested and working on both Mountain Lion and Mavericks with two U2713H monitors.