Currently Being ModeratedOct 26, 2013 3:54 AM (in response to 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!
Currently Being ModeratedOct 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
I dont understand that Apple cant come up with a solution, when it all worked great before OS X
A lot of people seems to run into display problems after that update.
Currently Being ModeratedOct 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
Currently Being ModeratedOct 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".
Currently Being ModeratedOct 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.
Currently Being ModeratedOct 27, 2013 3:25 AM (in response to Miska_FL)
Same result for me....not working.
Currently Being ModeratedOct 27, 2013 3:28 AM (in response to JBJ73)
Can you provide the brand model of your adaptor?
Currently Being ModeratedOct 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.
Currently Being ModeratedOct 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
Currently Being ModeratedOct 27, 2013 4:32 AM (in response to JBJ73)
Glad that work around did it for you thanks for the update.
Currently Being ModeratedOct 27, 2013 4:53 AM (in response to JBJ73)
Currently Being ModeratedOct 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.
Currently Being ModeratedDec 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).