2560x1600 via HDMI? Dell U3011 monitor.

Figured it out! I am successfully using Apple USB-C Digital AV Multiport Adapter with HDMI cable to Dell U3011.

The problem appears to be that the monitor has a faulty EDID over HDMI. It reports its native resolution to be 1900x1200 instead of 2560x1600. However, using SwitchResX, we can force the output to be full resolution.

• Install SwitchResX (follow directions for disabling System Integrity Protection). I used the trial version to test it out.
• Choose "DELL U3011 (2)" on the left-hand list.
• Choose Custom Resolutions tab.
• Add the following resolution: Choose "Custom resolution" in dropdown. Check "Use simplified settings". Select "CVT-RB". Set "Active": 2560 pixels x 1600 lines. Set "Scan rate": 60 Hz.
• Click OK, then Cmd-S to save.
• Reboot, then go to the "Current Resolutions" tab of SwitchResX, and choose the "2560x1600 , 60Hz (NTSC)" option.

I was able to get my Macbook Retina to display at 2560x1600 (30 Hz) on a Dell 3011 using the HDMI adapter when I installed Microsoft Windows 10. Had to go into the Intel Graphics Control Panel to define a new resolution of 2560x1600 at 30Hz and then it worked. This means there must be a software issue that prevents it from displaying at the full native resolution in MacOS.

Has anyone found a way around this issue in MacOS?

For the record, I'm running my U3011 at 2560x1600@50Hz via ordinary HDMI cable only. I've done this on a few OS's / machines.

Windows users: your graphics driver may allow you to add a custom resolution. I use 24 as the horizontal settings (front, scan and back intervals / porch) and 6 for the verticals. With the resolution above, 50Hz pushes the pixel clock to 212 MHz I believe, which seems to be about the limit the HDMI input can handle.

Linux: It's easy to translate the above into a modeline, and add using xrandr "addmode". Mild googling will solve.

OSX: I believe you can add an EDID override file. Hopefully the figures above can help, or just buy the adapter mentioned in the other replies.

Well.. at least you received the adapter.. Mine is saying backordered.

This is a deal breaker for me, I have the same monitor and if I can not connect at full res, that will be no good.

Any idea what the refresh rate is through the display link/DVI ?

Great to know this worked. I am trying to figure out the best monitor resolution I can buy and hook up to my new macbook at 60z.

There is some good info at this site about the technical stuff https://www.kickstarter.com/projects/kickshark/hydradock-11-port-usb-c-dock-for- apple-macbook/comments

I'm confused.. this seems to indicate it should all be possible directly via HDMI?

Using 4K displays and Ultra HD TVs with your Mac - Apple Support

PS, how did you get the adapter from USB-c to HDMI? Mine is still on backorder and not stocked in stores.

Are you able to charge your MacBook somehow while your display is hooked up?

Oh forgot you were using that adaptor. This review of the macbook from UK says: Apple says that a DisplayPort adapter is coming soon.

http://www.macworld.co.uk/review/mac-laptops/retina-macbook-2015-review-processo r-speed-benchmarks-price-3595594/

Hi, I bump this old discussion because I'm about to buy a Macbook that I plan to hook up to my old Dell 3008 FWP that I have in my office. Honestly I can hardly believe a simple HDMI-DVI (single-link) adapter can handle native resolution of 2560x1600, because DVI single link (not even considering the adapter) is not able to go that high. I remember when I bought this monitor I didn't even know about the existence of DVI dual-link, so I just hooked it to my PC with the existing single-link cable (to not have to pass it again behind the desk) and it looked awful. Then I took out of the monitor box the dual-link cable, used that and 2560x1600@60Hz looked wonderful.

Maybe a HDMI-DP adapter could work? Can't find anything suitable around...

Thanks for your post; can you share with us exactly which HDMI-to-DVI adapter you used?