Tried the latest  3.12.0-031200rc4-generic  64bit Kernel
This works much better:
- booting with card and USB-disk (USB-powered) inserted, is always working
- plugging in card first and after that a device, is not working
- plugging card with USB stick, work, but takes a long time
- plugging card with USB-disk (USB powered) together dousn work, and gives slow 
mouse response
- plugging card with USB-2-hub attached always works, it's possible to plug 
in/out disks and usb-sticks, but is slow
sorry I don't have a USB-3 hub, will buy one, if this works it's a very good 
work-around !!!
regards

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https://bugs.launchpad.net/bugs/1006765

Title:
  1033:0194 Hot plugging USB3.0 express card Not possible

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