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I am running Ubuntu 15.04 on my T450s (Intel graphics card) with kernel 4.0.8. I originally updated the kernel to be able to use two external monitors with my ultra dock.

Now, when I dock my running computer, only one of the two monitors display something. Looking in the "Displays" menu, I can see only my laptop screen and one of my monitor.

The workaround I found so far is to either log out or restart the computer, which is pretty annoying. How can I get my two screens working properly when docking my laptop?

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Please check out this: Kubuntu 15.04 nvidia optimus. This should help you get everythihg working very smoothly with docking/undocking as well.

/edit

Unless I am mistaken and your laptop does only have the Intel, and not the Nvidia as well. In which case I might be of no help for you.