Incorrect resolution displayed on mavericks external display 1080p

hi. i am running mavericks on imac (intel, amd radeon HD6970 1024mb) and have just added an external display (asus VN279) which i've tried connecting through both mini displayport to displayport and then mini displayport to hdmi. when i select the resolution i have an option for 1080p which is the native resolution of the monitor (and the one that i want to run), however, the resolution that actually comes on the screen is terrible and a totally different and lower one. any ideas on what could be wrong?
thanks
bruno

Hi,
Try to change the HDMI cable. I did display (X1 Carbon 20A7) 4K (3840 x 2160) on TCL (U49S7606DS) using very old but original Panasonic Viera HDMI 1.3a cable. I know it is strange and should not work but it works.
BTW: Here is what Lenovo officially says for the second generation of X1:
Graphics Intel HD Graphics 4400 or 5000 in processor,
external digital monitor support via Mini DisplayPort or HDMI (supports VGA analog monitor via Mini DisplayPort to VGA Monitor Cable); supports three independent displays;
Max external resolution:
3840x2160 (Mini DisplayPort)@30Hz;
2880x1620 (HDMI)@60Hz
Cheers,
a

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