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 :) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/999462 Title: ExpressCard34 slot not hotplugable after boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/999462/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs