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-   -   Ubuntu. USB keeps disconnecting or not recognizing (http://www.linuxquestions.org/questions/linux-hardware-18/ubuntu-usb-keeps-disconnecting-or-not-recognizing-762506/)

runequester 10-16-2009 10:12 PM

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.

snowtigger 10-16-2009 11:07 PM

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.

:)

runequester 10-16-2009 11:52 PM

Quote:

Originally Posted by snowtigger (Post 3722361)
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

fbsduser 10-17-2009 12:35 AM

It could also be the USB chipset in your mainboard.

runequester 10-18-2009 12:19 AM

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

sreekumarr84 11-10-2012 01:41 PM

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.


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