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(ubuntu 13.04)

If I connect my mouse in one USBv2 port on my laptop, it does not work. This is the output I get from dmesg:

usb 1-1.2: new full-speed USB device number 21 using ehci-pci
usb 1-1.2: device not accepting address 21, error -32
usb 1-1.2: new full-speed USB device number 22 using ehci-pci
usb 1-1.2: device not accepting address 22, error -32
hub 1-1:1.0: unable to enumerate USB device on port 2

Now, if I plug in a USB hub in that same port, I get:

usb 1-1.2: new high-speed USB device number 23 using ehci-pci
usb 1-1.2: New USB device found, idVendor=1a40, idProduct=0101
usb 1-1.2: New USB device strings: Mfr=0, Product=1, SerialNumber=0
usb 1-1.2: Product: USB 2.0 Hub
hub 1-1.2:1.0: USB hub found
hub 1-1.2:1.0: 4 ports detected

and, if I now plug the mouse in one of the ports of the hub I get:

usb 1-1.2.1: new full-speed USB device number 24 using ehci-pci
usb 1-1.2.1: New USB device found, idVendor=4168, idProduct=1011
usb 1-1.2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-1.2.1: Product: Targus Wireless Optical Mouse
usb 1-1.2.1: Manufacturer: reserved
input: reserved Targus Wireless Optical Mouse as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.1/1-1.2.1:1.0/input/input15
hid-generic 0003:4168:1011.0005: input,hiddev0,hidraw0: USB HID v1.11 Mouse [reserved    Targus Wireless Optical Mouse] on usb-0000:00:1a.0-1.2.1/input0

and the mouse works perfectly.

Well, I hope I can make the mouse work directly in the port without the hub.

Thanks in advance for any help!

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1 Answer

Well, a transitive kind of relationship.

A (your OS)does not recognise B(mouse), so A does not connect to B.

C (your hub) knows both both A as well as B, so connects.

Funny thing, but what else to say here.

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