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In Ubuntu 12.04 64bit, I installed nvidia-current-updates and enabled the discrete NVIDIA card only in BIOS (Optimus completely disabled). Ubuntu uses the nvidia driver but fails to detect an external DELL LCD U2311 connected to the display port. In Windows everything runs smoothly, it's only a SW problem.

In Displays window I can see only a Laptop screen and Detect Displays does nothing.

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is your laptop optimus enabled? In optimus you can't use nvidia card only. Optimus disabled means your intel card is working not nvidia. See this discussion askubuntu.com/q/119449/35775 –  Web-E Jun 28 '12 at 17:15
    
No. Optimus and NVIDIA vs. Intel are two independent choices. Optimus is disabled, NVIDIA enabled. –  James Jun 28 '12 at 20:15
    
I get the same thing. James, did you ever find a solution? –  vinnyjames Oct 10 '12 at 5:56
    
@vinnyjames Hi, my only solution is (whenever I use the DELL LCD) to switch to the DISCRETE GRAPHICS CARD (only, no Optimus) in the BIOS setup. Then reboot and everything works well. Of course, it's not a good idea to do that on battery. –  James Oct 10 '12 at 12:34
    
Do you use a dock or is that straight to the mini display port? –  vinnyjames Oct 10 '12 at 16:12

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