Portege Z30-A-18M - cannot set native resolution on external display

Hi,
I have tried to connect two different full HD displays to my Portege Z30-A-18M and I was unable to set the native resolution - maximal resolution that I can set for those is 1680x1050... I wasn't so surprised with the first one as I had some troubles with native resolution when I was connecting it to the Satellite laptop that I had before. But then the same happened when I tried the other display.
I thought that this laptop can handle higher external resolution... Is there a way how to force the native resolution for the external diplays in Windows 7?
Thanks!

Well, I wanted to use it as extended desktop... But I tried now to set it only to external device and I am still getting 1680x1050 as max
Just a note, the first display was connected with analog (D-SUB) and the second with digital (HDMI) ...
Is there a way how to override the maximum and set my own custom resolution?

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Wide Screen
Yes
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16.7M Colours
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Portege Z30-A-18M - cannot set native resolution on external display

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