https://bugs.freedesktop.org/show_bug.cgi?id=71930
--- Comment #9 from Mike Lothian mike@fireburn.co.uk --- I bisected back to [bbd34fcdd1b201e996235731a7c98fd5197d9e51] ACPI / hotplug / PCI: Register all devices under the given bridge
Which was during the 3.11 cycle I believe - I guess there's a chance I picked up on a previous bug I'll do some more testing