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Level 1

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MBP Retina shows wrong resolution on external display since 10.8.4

I have a MBP retina and I'm using it with an external display, Dell U2711, connected via a Mini-DP to DP cable. It all worked amazingly well until 10.8.4 came out. Now, when I connect the display, it no longer shows the correct 2560 X 1440 resolution, but shows 1080p. The displays preferences pane does not allow going over 1080p. It does recognize the display model, though.

It started with one port. The machine has two TB ports, so one of them worked fine and the other didn't (the one closer to the user was acting up). Then it degraded further to the second port. Now, if I plug and unplug several times and fiddle with the displays control panels, I might just get it right eventually. It takes some time, but eventually the machine gets it right. At least that's what I've been experiencing in the last few days.

I don't think it's a hardware issue. It's possible that my cable is at fault, but I seriously doubt that. I'm wondering if anyone else got the same problem, just checking before I go and splurge on a new cable (these cables are not easy to find).

Thanks,

MacBook Pro (Retina, Mid 2012), OS X Mountain Lion (10.8.4)

Posted on Jul 10, 2013 12:08 AM

17 replies

Ocean 17

Level 2

190 points

Jun 16, 2014 9:44 AM in response to vladimirku3n

I'm having the same problem.

I get this 1984 computer look with vastly reduced resolution. When I go to System preferences, there is no option for the 2560 resolution, and "best for display" is just garbage.

archron

Level 1

0 points

Jun 26, 2014 11:28 AM in response to Mazzlefizz

Mid-2012 MBPR, got a new Samsung SA850T, good for 2560x1440. Plugged it up and could get nothing above HDMI. Tried everything prior in this thread to get the monitor recognized, best I could get was 1600x1200.

On the off chance that it was a sub-par cable from Samsung, went out and got a mini-displayPort to displayPort cable for $16. Shutdown the MBPR this a.m., swapped cables (was using thunderbolt->DVI adapter from Apple and the manufacturer cable previously), and restarted.

All is well in the world now, with awesome real estate.

Hardware does matter evidently, and I'm happy to get the issue resolved at a small cost.

MBP Retina shows wrong resolution on external display since 10.8.4