odroid@odroid:~$ dmesg | grep -i usb
[ 4220.060006] hub 1-3:1.0: unable to enumerate USB device on port 2
[ 4220.315005] hub 1-3:1.0: unable to enumerate USB device on port 2
[ 4220.570005] hub 1-3:1.0: unable to enumerate USB device on port 2
[ 4220.825005] hub 1-3:1.0: unable to enumerate USB device on port 2
[ 4221.080005] hub 1-3:1.0: unable to enumerate USB device on port 2
[ 4221.340004] hub 1-3:1.0: unable to enumerate USB device on port 2
.
.
.
.
[ 4466.841879] hub 1-3:1.0: unable to enumerate USB device on port 2
[ 4467.136639] usb 1-3.2: new full-speed USB device number 95 using s5p-ehci
[ 4467.166893] hub 1-3:1.0: unable to enumerate USB device on port 2
.
.
.
[ 4541.850129] hub 1-3:1.0: unable to enumerate USB device on port 2