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My DELL 27inch monitor should be capable of 2560x1440 resolution. I've confirmed with Ubuntu 12.04 NVIDIA with DVI connection. Now on 14.04 Intel® HD 4600 with HDMI, the maximum resolution I see is only 1920x1080.

$ xrandr
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
   1920x1080      60.0*+   60.0     50.0     59.9     24.0     24.0  
   1920x1080i     60.1     50.0     60.0  
   1600x1200      60.0  

Among many similar issues on askubuntu.com, I saw this one gives a command set that seems kind of promising, but after xrandr --output HDMI1 --mode 2560x1440, the OS' display setting tool says the display got 2560x1440 (that's what I want) but the DELL monitor got blacked-off and stated:

Current input timing is not supported by the monitor display. Please change your input timing to 1920x1080@60Hz or any other monitor listed timing as per the monitor spec.

How can I get 2560x1440 on my external DELL monitor?

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