The following fixed the problem for my USB 3 Expresscard (NEC
uPD720200):

    sudo echo acpiphp >> /etc/modules:

Modify /etc/default/grub to have:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pciehp_force=1
pciehp_poll_mode=1"

and run

    sudo update-grub

Now hotplugging works as expected.

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https://bugs.launchpad.net/bugs/999462

Title:
  ExpressCard34 slot not hotplugable after boot

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