當使用者使用pdcmd開啓USBHost模式後，會發現無法再度使用pdcmd關閉USBHost，這是因為pdcmd script在判斷ehci-hcd時，誤將ehci_hcd寫成ehci-hcd，使用者可以使用如下方式修復：
$ sudo vim /usr/sbin/pdcmd
USBHostTrigger(){
if [ -z "$(lsmod | grep ehci_hcd)" ]; then
msg "USB Host" "Start"
modprobe ehci-hcd
else
msg "USB Host" "Stop"
rmmod ehci-hcd
fi
}
Enable USBHost
$ sudo pdcmd USBHostTrigger
$ sudo dmesg -c
[ 3706.670959] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 3707.675842] ehci-omap ehci-omap.0: OMAP-EHCI Host Controller
[ 3707.682373] ehci-omap ehci-omap.0: new USB bus registered, assigned bus number 1
[ 3707.687225] ehci-omap ehci-omap.0: irq 77, io mem 0x48064800
[ 3707.699645] ehci-omap ehci-omap.0: USB 2.0 started, EHCI 1.00
[ 3707.699981] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 3707.700103] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 3707.700317] usb usb1: Product: OMAP-EHCI Host Controller
[ 3707.700531] usb usb1: Manufacturer: Linux 3.2.45 ehci_hcd
[ 3707.700653] usb usb1: SerialNumber: ehci-omap.0
[ 3707.707794] hub 1-0:1.0: USB hub found
[ 3707.708038] hub 1-0:1.0: 3 ports detected
Disable USBHost
$ sudo pdcmd USBHostTrigger
$ sudo dmesg -c
[ 3725.640502] ehci-omap ehci-omap.0: remove, state 4
[ 3725.640747] usb usb1: USB disconnect, device number 1
[ 3725.643341] ehci-omap ehci-omap.0: USB bus 1 deregistered