I have a new 15" rMBP hooked up to 2 external monitors:
1) 1280x1024 NEC MultiSync 90GX (oldie but greatie) via a Thunderbolt/MiniDisplayPort-to-DVI adapter cable -- PERFECT
2) 1920x1080 LG Flatron M2380D via a Thunderbolt/MiniDisplayPort-to-HDMI adapter cable -- TERRIBLE
The M2380 shows the screen, not just the cursor as you mentioned. But the resolution is definitely off.
I have tried the "best for display" setting, as well as each of the 4 manual "scaled" settings (1080p, 1080i, 720p and 1600x900). The 1080p and 1080i settings are both terrible, but have text at the right size. The other two settings are easier on the eyes, but at the expense of a lot of screen real estate. So I am trying to fix the 1080p setting.
I have to set the underscan to just about the third tick-mark on the way to "more" -- which is stupid. The Mac and monitor should communicate to allow auto-detecting the resolution, and display accordingly. And with or without underscan (at various settings), the images on screen are bad enough to actually cause immediate eyestrain.
I give credence to the idea that larger monitors need dual-DVI. But this is HDMI, so there should be no issue with that bandwidth limitation.
But, I believe it is a problem with HDMI, as I had a similar issue hooking up the LG monitor to my Dell Windows 7 PC. I ended up using an VGA cable, and it worked perfectly. Gads, if I have to get a Thunderbolt/MiniDisplayPort-to-VGA cable adapter, I'll cry. HDMI should just WORK!
I would really appreciate other people's experiences to see if there are any configuration tweaks I can make to set this right. Thanks!
Message was edited by: mevans567