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. -- 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/udev/+bug/999462/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs