I will now attach files from 2.6.17-11 that show the device working
properly:

Linux novosirj-laptop 2.6.17-11-generic #2 SMP Thu Feb 1 19:52:28 UTC
2007 i686 GNU/Linux

** Summary changed:

- USB fingerprint reader broken in 2.6.20-13, worked fine in 2.6.17-11
+ USB device detection problems in 2.6.20

** Description changed:

  Binary package hint: linux-image-2.6.20-13-generic
+ Still present in: linux-image-2.6.20-14-generic
  
  Upgraded to Kubuntu Feisty Fawn 7.04, kernel 2.6.20-13 installed.
  pam_bioapi was working fine under 2.6.17-11, but immediately after
  upgrade, I am experiencing USB problems. Attempting to login, the pam
  module causes the following to be printed to stdout:
  
  [  357.656000] hub 1-2.3:1.0: hub_port_status failed (err = -71)
  [  357.656000] hub 1-2.3:1.0: cannot disable port 1 (err = -71)
  [  357.660000] hub 1-2.3:1.0: hub_port_status failed (err = -71)
  [  357.768000] hub 1-2:1.0: port 3 disabled by hub (EMI?), re-enabling...
  
- This worked a total of one time (not the first time I tried it either,
+ This works very occasionally (not the first time I tried it either,
  somewhere around the 20-30th time that the module was used) and not
- again. The machine consistently prints that error and falls back to
- password auth every time.
+ consistently. Other than that, the machine consistently prints that
+ error and falls back to password auth every time.
  
- The only special boot option I have is pci=assign-busses as dmesg
- recommends it:
+ The only special boot options I have tried are pci=assign-busses and
+ pci=routeirq as dmesg recommends them:
  
  Apr  3 18:19:43 novosirj-laptop kernel: [    0.205402] PCI: Bus #04 (-#07) is 
hidden behind transparent bridge #03 (-#04) (try 'pci=assi
  gn-busses')
  Apr  3 18:19:43 novosirj-laptop kernel: [    0.205404] Please report the 
result to linux-kernel to fix this permanently
  
- ...but this has apparently no effect. A recompile of the module also had
- no effect.
+ ...but this has apparently no effect, except appeared to make things
+ slightly worse. A recompile of the module also had no effect.
  
  Another bit of information is that this DOES continue to work if I boot
  back into the still-installed linux-image-2.6.17-11. This makes me think
  it may not be related to an installed base of libraries.
  
  Please advise me if I may need to provide more information.

** Attachment added: "dmesg from machine with working USB in 2.6.17-11"
   http://librarian.launchpad.net/7286006/dmesg-working.log

-- 
USB device detection problems in 2.6.20
https://bugs.launchpad.net/bugs/102659
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