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Ubuntu was running perfectly, suddenly my internal HDD partitions (except file system) and partitions of external HDD disappeared. I was able to mount the partitions of internal HDD via disk utility, but I couldn't find the external HDD. I tried Gparted partition editor and it couldn't find the device. I tried my HP flash drive and found that all the USB devices were not shown up.

Here is the result of lsusb

:~$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 002: ID 04f3:0230 Elan Microelectronics Corp. 3D Optical Mouse
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Check if the hardware and kernel components are responding when you plug a device. To do this, see the last few lines of output of the command dmesg as soon as you plug the device in. Post the output here, so we try to figure out what the problem is. –  donatello Aug 14 '12 at 10:20

1 Answer 1

I have something similar happening - suddenly all 4 USB ports stopped working.

dmesg when wireless mouse plugged in gives the following result:

32240] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3410.856236] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3411.168269] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3413.088268] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3413.528129] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3415.448262] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3415.888309] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3417.808144] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3419.208285] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3421.128241] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3421.792111] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3423.712082] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3424.792100] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3426.712153] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3427.088197] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3429.008225] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3430.376118] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3432.296077] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3432.672138] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3434.592064] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3435.032077] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3436.952282] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3437.488105] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3439.408067] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3439.848115] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3441.768084] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3443.072270] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3444.992214] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3445.880269] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3447.800253] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3448.784278] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3450.704276] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3451.080282] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3453.000089] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3453.504133] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3455.424065] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3455.736166] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3457.656172] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3458.416208] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3460.336249] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3461.352148] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3463.272114] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3463.648264] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3465.572256] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3466.084283] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3468.004259] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3468.348282] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3470.268236] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3470.676315] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3472.596210] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3473.036299] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3474.956248] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3475.300289] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3477.220235] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3477.692125] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3479.612242] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3479.924297] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3481.844233] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3482.668105] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3484.588075] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3485.060095] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3486.980168] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3487.356111] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3489.276193] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3489.588200] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3491.508080] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3491.916279] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3493.840262] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3494.440297] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3496.360076] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3497.728286] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3499.648242] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3500.700176] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3502.620078] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3502.932284] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3504.852259] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3505.388289] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3507.308263] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3507.716171] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3509.636263] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3510.172119] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3512.092212] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3512.660294] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3514.580261] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3515.180293] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3517.100161] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3517.540113] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3519.460109] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3520.572244] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3522.492275] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3523.124292] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3525.044252] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3525.388292] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3527.548261] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3527.860288] hub 8-0:1.0: unable to enumerate USB device on port 2
[ 3529.780259] hub 2-0:1.0: connect-debounce failed, port 3 disabled
[ 3529.892238] usb 6-2: new full-speed USB device number 14 using uhci_hcd
[ 3530.680241] usb 6-2: device descriptor read/64, error -71
[ 3530.904263] usb 6-2: device descriptor read/64, error -71
[ 3531.120256] usb 6-2: new full-speed USB device number 15 using uhci_hcd
[ 3531.240249] usb 6-2: device descriptor read/64, error -71
[ 3531.464259] usb 6-2: device descriptor read/64, error -71
[ 3531.680251] usb 6-2: new full-speed USB device number 16 using uhci_hcd

What next?

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