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Old 10-16-2009, 11:12 PM   #1
runequester
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Ubuntu. USB keeps disconnecting or not recognizing


All of a sudden, USB seems to be haywire. I was on Jaunty but upgraded to Karmic, but that did not fix anything.

USB devices will either not be recognized when I plug them in (a usb game pad or my blackberry), or will be recognized, then disconnect

When it does show up, after a few minutes, dmesg will show this:

[24931.888638] usb 2-9: USB disconnect, address 12
[24945.152039] hub 2-0:1.0: unable to enumerate USB device on port 9

It'll keep disconnecting, then slightly later recognize the device again, with a new address.
 
Old 10-17-2009, 12:07 AM   #2
snowtigger
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I've seen something similar to this and it turned out to be faulty hardware. Do you plug your devices into a hub or directly into the port? If so remove the hub, or a different cable.
You may also be a power problem.

It could possibly be software related though.


Last edited by snowtigger; 10-17-2009 at 12:08 AM.
 
Old 10-17-2009, 12:52 AM   #3
runequester
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Quote:
Originally Posted by snowtigger View Post
I've seen something similar to this and it turned out to be faulty hardware. Do you plug your devices into a hub or directly into the port? If so remove the hub, or a different cable.
You may also be a power problem.

It could possibly be software related though.

It plugs directly into the port. I tested the same hardware on my wife's laptop running osX, and it works fine there. So Im thinking the cable is fine
 
Old 10-17-2009, 01:35 AM   #4
fbsduser
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It could also be the USB chipset in your mainboard.
 
Old 10-18-2009, 01:19 AM   #5
runequester
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Did a few more tests and my blackberry does connect fine every time.

I'll see if I can pick up another usb gamepad just to verify though it works on another computer okay
 
Old 11-10-2012, 02:41 PM   #6
sreekumarr84
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Similar issue on quantal

Did you ever find the reason for this issue or was it resolved? I have a similar issue in latest ubuntu quantal (12.10). I am connecting an MTP android device. The very first time it worked for some time, then it stopped. Later connecting/disconnecting the device doesn't show anything on dmesg. On reboot with the device connected physically, dmesg shows the device connection and disconnecton logs back to back.

[ 2.505545] usb 2-1.4: new high-speed USB device number 4 using ehci_hcd
[ 2.599906] usb 2-1.4: New USB device found, idVendor=04e8, idProduct=6860
[ 2.599921] usb 2-1.4: New USB device strings: Mfr=2, Product=3, SerialNumber=4
[ 2.599932] usb 2-1.4: Product: SAMSUNG_Android
[ 2.599939] usb 2-1.4: Manufacturer: SAMSUNG
[ 2.599946] usb 2-1.4: SerialNumber: 4d...5d
[ 2.652289] usb 2-1.4: USB disconnect, device number 4

The same works with windows dual boot on same machine. So don't think it is a hardware issue in anyway.

Last edited by sreekumarr84; 11-10-2012 at 02:42 PM. Reason: removed serial
 
  


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