How do I get 2560 x 1440 on a Dell P2815Q?

Question

I have several of these Dell P2815Q monitors and despite various online reviews I think they are fantastic.  I have one connected to my MacBook Air running Bootcamp and I can drive it at 2560x1440 no problem using the minidisplay to display port cable included with the monitor.  I've set up one at home on a Surface Pro 3 and can also get 2560x1440 using minidisplay port cable. I recently picked up another one for a coworker but I'm not able to get hers to run at the same resolution.  When I connect her monitor to my Air using the same cable that I use I'm not able to set it to 2560x1440.  Any idea what's going on?   Is there something different about the two monitors even though they are the same model?  When I look at the Intel HD Graphics Control Panel while connected to my P2815Q the display is listed as Digital Television DELL P2815Q.  When I connect to her 2815Q and look at the same setting in the Intel HD Graphics Control Panel is says Digital Display. I can't find anything obvious in the monitor's controls to make any change.  I've tried resetting hers to factory multiple times without any luck.  I'm reluctant to reset mine to factory since I'm getting the resolution I want. What can I do to enable 2560x1440 resolution on her 2815Q? Thanks!

DELL-Chris M · Answer

List the 20 digit serial numbers and revisions for all P2815Q. Can you test your monitor on her computer?

OneMoreUserName · Answer

Hi Chris

My monitor is S/N: CN-OWJJGR-72872-48Q-AJ6M

REV A02

Her monitor is S/N CN-0WJJGR-72872-45U-A1PM

REV A01

Additional non 2560 monitor S/N CN-OWJJGR-72872-48L-A2TM

REV A01

I'll have to check my wife's at home.

Do you think this is a difference between the A01 and A02? Is there a way for me to perform a firmware update to correct this? Would Dell do a swap/exchange?

Thanks,

Scott

DELL-Chris M · Answer

S/N:CN-0WJJGR-72872-48Q-AJ6M REV A02 = August 26, 2014
S/N CN-0WJJGR-72872-45U-A1PM REV A01 = May 30, 2014
S/N CN-OWJJGR-72872-48L-A2TM REV A01 = August 21, 2014

The details of the differences are not provided to us. Firmware updates are only performed in our service center. Based on the chart on page 24, 2560x1440 is an unknown/untested resolution. You could exchange the A01s but it may not fix the issue. Regardless of the label, the used exchanges will be at the latest revision.

Monitors

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