[fprint] fprintd rejects sedond and other verify attempts

[Bastien Nocera]

On Wed, 2009-02-18 at 12:37 +0100, Jaroslav Barton wrote:
> Hi all!
> 
> I've just updated kernel to 2.6.28.1-19.fc10 and fprintd stops working. First 
> verify, identify, enrol attempt is allowed, but second and others results in
> 
> pam_fprintd(su): Verify result: verify-unknown-error
> 
> or
> 
> $ fprintd-enroll djaara
> Using device /net/reactivated/Fprint/Device/0
> Enrolling right index finger.
> Enroll result: enroll-unknown-error
> 
> without I touched sensor.
> 
> I tried update libusb from version 0.9 to 1.0 (downloaded from sf.net). This 
> allows me first attempt.
> 
> Are there some changes in libusb, or kernel which causes this problem?

This means libfprint barfed on something the device did.

You'll want to test with earlier kernel and see if that changes
anything. There was a bug in 2.6.28 kernels with USB devices which
caused problems with fingerprint software.

Anything else, and fprint debug output will be needed.