JBJ73

Q: 2560x1440 resolution no longer available on external display

Hi,

 

since OS X 10.8.4 Mountain Lion update and now also Maverick update, I can no longer select the 2560x1440 resolution to my

external Dell U2711 display. 1080p is the highest availible resolution now.

 

I have a 15" Macbook pro retina 2012 and use a mini displayport to displayport cable to connect to my Dell U2711 display.

 

Is it a cable issue or what is the problem?    (the cable worked great with full 2560x1440 resolution up until 10.8.4)

 

 

Best regards

Jørgen

Denmark

MacBook Pro with Retina display, OS X Mavericks (10.9)

Posted on Oct 26, 2013 2:05 AM

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Q: 2560x1440 resolution no longer available on external display

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  • by listik,

    listik listik Oct 26, 2013 3:54 AM in response to JBJ73
    Level 1 (0 points)
    Oct 26, 2013 3:54 AM in response to JBJ73

    Hi JBJ73,

     

    the same was just happening to me, and after some hard research I ended up finding this. Looks like Mavericks has some trouble with the default EDID config of some displays.

    Down the page you will find a ruby script that suposedly generates an EDID file adequate to any display, but that ended up not working for me either.

     

    I was able to get my U2711 full resolution through displayport by using the first file linked by the OP (I know it's suposedly for other Dell displays, but trust me, it has worked for my U2711).

     

    You should decompress the zip, and it will create a folder named U2713H_U2713HM_Mac_EDID_override. Get inside that folder using Terminal, and then copy the folder it contains into /System/Library/Displays/Overrides using the following command:

     

    sudo cp DisplayVendorID-10ac /System/Library/Displays/Overrides

     

    (You need to use sudo because you are copying the files to a folder owned by root)

     

    Hope this helps!

  • by JBJ73,

    JBJ73 JBJ73 Oct 27, 2013 1:32 AM in response to listik
    Level 1 (0 points)
    Oct 27, 2013 1:32 AM in response to listik

    Thank you for your suggestion.

     

    I gave it a try but Im still not able to select the 2560x1440 resolution. 1080p is the highest resolution

    availible.

     

    I dont understand that Apple cant come up with a solution, when it all worked great before OS X

    10.8.4 update.

     

    A lot of people seems to run into display problems after that update.

  • by Miska_FL,

    Miska_FL Miska_FL Oct 27, 2013 1:38 AM in response to JBJ73
    Level 2 (390 points)
    Oct 27, 2013 1:38 AM in response to JBJ73

    While inside System Preferences > Displays | Hold the option key > Detect Displays if still doesn't work after PRAM reset from here: http://support.apple.com/kb/HT1379

  • by JBJ73,

    JBJ73 JBJ73 Oct 27, 2013 2:41 AM in response to Miska_FL
    Level 1 (0 points)
    Oct 27, 2013 2:41 AM in response to Miska_FL

    I have tried resetting the PRAM but unfortunately it didnt work either. 1080p keeps on being the max

    resolution availible even when using Displays / "option key".

  • by Miska_FL,

    Miska_FL Miska_FL Oct 27, 2013 2:44 AM in response to JBJ73
    Level 2 (390 points)
    Oct 27, 2013 2:44 AM in response to JBJ73

    Not sure if you know this but when you PRAM make sure the adator is NOT connected, reconnect once you back on the Desktop.

  • by JBJ73,

    JBJ73 JBJ73 Oct 27, 2013 3:25 AM in response to Miska_FL
    Level 1 (0 points)
    Oct 27, 2013 3:25 AM in response to Miska_FL

    Same result for me....not working.

  • by Miska_FL,

    Miska_FL Miska_FL Oct 27, 2013 3:28 AM in response to JBJ73
    Level 2 (390 points)
    Oct 27, 2013 3:28 AM in response to JBJ73

    Can you provide the brand model of your adaptor?

  • by JBJ73,

    JBJ73 JBJ73 Oct 27, 2013 3:41 AM in response to JBJ73
    Level 1 (0 points)
    Oct 27, 2013 3:41 AM in response to JBJ73

    I have found an temporaily solution and that is to boot into bootcamp (windows 8.1) where I CAN set and run the  2560x1440 resolution on my 15” Macbook pro retina 2012.

     

    Restarting Windows 8.1 (with 2560x1440 resolution) to go back to OS X, brings me oddly enough back into OS X Maverick with the same resolution of 2560x1440!

     

    Maybe this information  can help Apple fix the resolution problem since 10.8.4 update.

  • by JBJ73,

    JBJ73 JBJ73 Oct 27, 2013 3:50 AM in response to Miska_FL
    Level 1 (0 points)
    Oct 27, 2013 3:50 AM in response to Miska_FL

    I believe I misunderstood what you wrote me before….when you said adapter I believed you thought about the power adapter that needed to be disconnected.

     

    I use a  mini displayport to displayport cable without adapter to connect to my Dell U2711 display, and it worked just fine up until 10.8.4

  • by Miska_FL,

    Miska_FL Miska_FL Oct 27, 2013 4:32 AM in response to JBJ73
    Level 2 (390 points)
    Oct 27, 2013 4:32 AM in response to JBJ73

    Glad that work around did it for you thanks for the update.

  • by actionmarker,

    actionmarker actionmarker Oct 27, 2013 4:53 AM in response to JBJ73
    Level 4 (1,883 points)
    Mac OS X
    Oct 27, 2013 4:53 AM in response to JBJ73

    Try this;

     

    Hold the Option button when clicking on Scaled, see if the correct resolution now becomes avaliable.

     

     

     

    Screen Shot 2013-10-26 at 9.53.48 pm.png

  • by j5kauppi,

    j5kauppi j5kauppi Oct 29, 2013 3:21 PM in response to actionmarker
    Level 1 (0 points)
    Oct 29, 2013 3:21 PM in response to actionmarker

    Thank you actionmaker, that is the solution! I had exactly the same problem. I also have same Dell display as jbj73 has.

  • by LitzD,

    LitzD LitzD Dec 16, 2013 3:18 PM in response to Miska_FL
    Level 1 (0 points)
    Dec 16, 2013 3:18 PM in response to Miska_FL

    I have two ASUS PB278 which I connected with HDMI originally (1080p was best option), and switched to a mini-display port to display port connection, and resetting the PRAM worked for me! Thanks!

     

    One thing to note is after I restarted and reset the PRAM, even though I could select 2560x1440, I had to also turn the monitors off then back on (they had some artifact lines being drawn before doing this).

  • by h4nc0,

    h4nc0 h4nc0 May 6, 2014 8:13 PM in response to actionmarker
    Level 1 (5 points)
    May 6, 2014 8:13 PM in response to actionmarker

    I wasn't getting HiDPi modes shown in the display preference and holding down Option key worked.  Thank you!

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