T420s display port won't drive 2560x1600?

Hi all,
Just received a T420s, udpating from a T410s. The T410s has the switchable graphics. When connected with a display port cable using a series 3 docking station, the old T410s will drive my Dell 3008 at its native 2560x1600 resolution without any trouble.
The new T420s will *not*, no matter what I do. Same cable, same monitor, same docking station, etc. The highest it will go is 2016 x 1000-something (writing from home and going by memory, sorry I don't know the exact numbers).
Any ideas? This is a real bummer as I really need the extra real estate. Every tech spec says it will do the right resolution, but it simply won't.. I don't even get the option in the NVIDIA control panel. It won't let me put in 2560x1600 as a custom resolution. Display driver appears up to date. As I've said, there's nothing wrong with the cable, monitor, connection.
Solved!
Go to Solution.

Wanted to give everybody an update on this situation. Previously I indicated that the suggestion to change the BIOS to discrete graphics only fixed this problem. Turns out I spoke too soon - it seems that even with this setting, I only get native 2560x1600 resolution 25% of the time. Fiddling around with other settings did nothing, in the end I concluded that the discrete vs. optimus setting in the BIOS didn't do anything to help me - I just got lucky following the BIOS suggestion. There may be other things that correlate with this 25%, but I don't have time to track down what they might be.
I finally found a permanent solution by changing from the default Lenovo display driver to a beta NVS 4200M driver from the NVIDIA website. Installed this a couple of days ago and my system now goes into 2560x1600 every time it is placed in the dock.
I have not revisited the discrete vs. optimus setting in the BIOS, but will eventually. Regardless, I conclude there's a problem with the Lenovo NVS 4200M drivers. FYI, I was running the 8.17.12.6696 version for Win7 64bit. I am now running the 275.27 beta drivers from NVIDIA. Everything else seems stable with these drivers, including the hardcore 3D modeling application I use at high resolution.

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I too am having this same problem with my Macbook Air (Late 2010 Edition). I think this has something to do with OSX 10.6.6. Before the update, my mini display to HDMI was working flawlessly. Now, when I try to plug in to the TV my macbook just flashes the blue screen with no picture going to the TV what so ever. I'm not sure what was done with the update, but i'd sure like to be able to connect this machine to the TV again! APPLE, HEAR OUR VOICES! Fix this problem!

I just ran a software update for Java and MacBook Pro SMC, now my Mini Display Port to HDMI TV is not working. The TV is flickering. The Mac Display is fine.

I was just watching / streaming TV off Safari on my actual TV.
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Software update popped-up and said there was an update for Java and for SMC.
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It won't work in Mirroring or set up as an extended display.
I've reset SMC / PRAM / Safe Mode / Even restored from a Time Machine backup (From before the updates were done).
What could it be?!

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