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too, but that's not critical): real hubs send port status change notifications until acknowledged, ehci/ohci send only once so there is a chance that this gets lost if notifications are disabled during a scan. The temporary fix is to force a rescan; the real fix will involve a change in interrupt handling in ehci/ohci which needs more work and testing. ehci is critical because a port status change during scan regularely happens if a full/lowspeed device is connected, due to the handover process. Fixes a problem where full/lowspeed devices were not reattached after a disconnect, reported by Kouichirou Hiratsuka and Juan RP on current-users.