I have also noticed the Kernel-PnP Event ID 219 warning. I own a Z97-Pro board.
Please Asus, fix this once and for all!
edit: I've just read here and other places that those warnings are nothing to be worried about. Also that Microsoft has to put a bit on his part to solve this issues.
Apparently the problem didn't go away, using a external HDD with two USB ports on one end to operate the drive caused the computer to play a song with the Plug-in play notification sound and knew it was insignificant power been suppled to the ports. The drivers that I installed from ASUS was the cause of the fault or Intel either way it wasn't installing correctly. It was either Intel(R) Chipset Software Installation Utility v10.0.14 or v10.0.17 can't really remember. So after restoring the Machine back to a clean installation it was time to get to the bottom of this, uninstalled Intel USB 3.0 Driver V126.96.36.199 rebooted and install the latest ASUS Intel Chipset driver v10.0.20.
Looking at the Device Manger at the time I seen two Standard PCI host controller to USB controllers something like that again can't really remember the specific name and Intel device where the USB 3.0 drivers were uninstalled. Reinstalled Intel USB 3.0 eXtensible V188.8.131.52 Host Controller driver and it was still reporting Standard PCI host controller for one of them even after rebooting.
So at this point I had USB 3.0 eXtensible Host Controller and Intel 9 Series Chipset Family USB Enhanced Host Controller 8CA6 showing correctly in the Device Manager. Reading the news on The Guru of 3D yes thank you and seen Intel updated there chipset driver basically a .ini file and downloaded it. Knowing ASUS wasn't going to update there website with the latest version. Installing the driver Hard Lock the USB ports, lucky for me I had a keyboard using the PS2 port because all the USB ports were killed by the Chipset driver installation.
Restarted the computer and reinstalled them on top of the same ones theres over writing them and giving me back my mouse. Open the Device Manager and the Standard PCI Host Controller was now reporting Intel 9 Series Chipset Family USB Enhanced Host Controller - 8CAD. Everything seems fine and managed to get a ten hour day of productively without the Flash drives disconnecting and reconnecting, but did hear the Plug-in play sound when the computer came back out of sleep.
I disabled Sleep and the USB suspend option along with the Power options in the device manger, right-click on Hub and select Power Management tab.
Has of now the problem seems a lot better then before, who to blame both Intel and ASUS, there's just one little thing in the Even Viewer with ACPI Warning about some driver, sad thing it's installed even read the same problem on their forums and it still pops up ever now and then. Time to enjoy some games and not have to worry about the flash drives playing a song. If theres any more problems I'll just probably RMA it before it gets to late or just purchase a new that doesn't have a ASUS branding on it. You may want to disable all the USB ports you ant using in the UEFI-BIOS Rom, along with the Asmedia controller if you have no use for it.