I have to retract my statement. I'm using a Lenovo x220. 
Disabling "PCI Express Power management" (Config -> Power) via Bios resolves 
the issue for me. Before Ubuntu became unresponsive (like the card is throwing 
a lot of interrupts) after the *2nd* hot-plug, first one seems fine though. On 
AC or Battery did not change the behavior.
Also I noticed "ACPI FADT declares the system doesn't support PCIe ASPM"
in dmesg, so I'm not sure this bug is even related. I leave it here for
people who have similar issues :)

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

Title:
  ExpressCard34 slot not hotplugable after boot

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