Connecting Dell U3011 to retina MacBook Pro via mini DisplayPort I am trying to hook up my Dell u3011 to my retina MacBook Pro using a mini DisplayPort to DisplayPort connector, and finding myself a bit perplexed as to why it doesn't work. Basically the top resolution that Mac OS X allows on the external display is either 1080p or 1280x1024(scaled!), while monitor's native resolution is 2560x1600. I Googled around and people recommend using SwitchResX tool, to fix the issue, but I am curious if there is a way to force the correct resolution with native tools(cli or some obscure settings?).

Note: I am using OS X Mountain Lion. The miniDisplayPort to DisplayPort connector is from Monoprice.
Try resetting the PRAM and see if it detects the proper screen resolutions. If that still doesn't work, you could try cscreen (a command line tool to set a resolution) or SwitchResX.