Comment 10 for bug 102659

I have this same problem on Dell Latitude D620 and 2.6.20-15: lsusb with first run doesn't list fingerprint reader, then with the next run it lists it. Later runs may again show it without fingerprint reader, since USB hub keeps reloading itself.

The gist of the messages appearing in /var/log/messages and dmesg is:

[ 62.412000] hub 2-2.3:1.0: hub_port_status failed (err = -71)
[ 62.412000] hub 2-2.3:1.0: cannot disable port 1 (err = -71)
[ 62.412000] hub 2-2.3:1.0: hub_port_status failed (err = -71)
[ 62.416000] hub 2-2.3:1.0: hub_port_status failed (err = -71)
[ 62.416000] hub 2-2.3:1.0: cannot disable port 2 (err = -71)
[ 62.416000] hub 2-2.3:1.0: hub_port_status failed (err = -71)
[ 62.420000] hub 2-2.3:1.0: hub_port_status failed (err = -71)
[ 62.480000] hub 2-2:1.0: port 3 disabled by hub (EMI?), re-enabling...
[ 62.480000] usb 2-2.3: USB disconnect, address 3
[ 62.480000] usb 2-2.3.1: USB disconnect, address 5
[ 62.484000] usb 2-2.3.2: USB disconnect, address 6
[ 62.556000] usb 2-2.3: new full speed USB device using uhci_hcd and address 7
[ 62.684000] usb 2-2.3: configuration #1 chosen from 1 choice
[ 62.688000] hub 2-2.3:1.0: USB hub found
[ 62.688000] hub 2-2.3:1.0: 3 ports detected
[ 63.004000] usb 2-2.3.1: new full speed USB device using uhci_hcd and address 8
[ 63.140000] usb 2-2.3.1: configuration #1 chosen from 1 choice
[ 63.348000] usb 2-2.3.2: new full speed USB device using uhci_hcd and address 9
[ 63.468000] usb 2-2.3.2: configuration #1 chosen from 1 choice
[ 67.568000] Bluetooth: L2CAP ver 2.8
[ 67.568000] Bluetooth: L2CAP socket layer initialized
[

This leads to fingerprint reader (and bluetooth, which sits on the same USB line, apparently) being pretty unstable (sometimes working, sometimes not), but it "wakes up" on every access to USB devices after a few seconds.

All this works fine with 2.6.17-11 from Edgy.