How to display 2560x1080 on external monitor from MBP or MBA?

Is there any way to make MBP 17 (Intel HD and nVidia GT graphics, SnowLeo) or MBA 13 (Mountain Lion) display 2560x1080 on external monitor (LG 29" ultrawide)? My MacPro with RadeonX1900 card (10.5.8) does it perfectly but I cannot find a way to get the laptops to do it. Tried res. switching apps, still no good. Thanks.

It worked perfect for me. Maybe settings should be different for your laptops. In my case I'm using a MBP 15" with a GeForce 330M.
The monitor I have is the LG 29EA93 (21:9) @ 2560 x 1080.
Make sure you have exactly same values in Switch Res X. Special attention to "Scan rate".
You can see in the capture below that it's working
and, just in case, here you have the settings that worked for me
It might be also different for each video card...
Greetings!!

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Dear pgerratico
Welcome to Lenovo forums
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How to display 2560x1080 on external monitor from MBP or MBA?

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