X220 display port not detecting Dell u2412M monitor

My new Dell U2412 1920x1200 is not recognized by te Lenovo X220 DisplayPort connector. I read that this may be a common problem. Is it so?
It shows a single monitor when monitor connected through dislay port (og with vga output)

yes it is. Try to use a displayport to dvi converter to connect to the LCD.
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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