Comment 3 for bug 1415348

Same problem on a Dell Vostro 5480 with reader 138a:0011 Validity Sensors, Inc. VFS5011

But the problem does not occur on fprint_demo. I posted a message to fingerprint-gui about this:

http://home.ullrich-online.cc/fingerprint/Forum/topic.php?TopicId=519&Posts=0

Here's a copy of I what I observed and posted to the fingerprint-gui forum

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Hi, I just got a Dell Vostro 5480 with a fresh Ubuntu 14.04 pre-installed by Dell. Tried to use Fingerprint-GUI, but cannot enroll. First enroll works, and all the others fail. My reader is:

Bus 002 Device 014: ID 138a:0011 Validity Sensors, Inc. VFS5011 Fingerprint Reader

I searched the Internet and found 5 or 6 similar posts on several forums, all with no solution.

Here's the details:

Install:

sudo add-apt-repository ppa:fingerprint/fingerprint-gui
apt-get update
apt-get upgrade
sudo apt-get install libbsapi policykit-1-fingerprint-gui fingerprint-gui

Logged off and logged in

From a terminal, I tried:

fingerprint-gui

or

fingerprint-gui debug

The reader is detect, and I can select the finger. When I go to the Scan/Verify tab, it says "Please swipe Your Right Index"

I swipe the finger and it shows OK with a green check and asks for a second scan, but no more scans work.

auth.log shows:

Feb 6 14:45:31 vostro fingerprint-gui[20691]: Need 1 stages.
Feb 6 14:45:31 vostro fingerprint-gui[20691]: Please Swipe Your Right Index.
Feb 6 14:45:31 vostro fingerprint-gui[20691]: Swipe finger at vfs5011.
Feb 6 14:45:31 vostro fingerprint-gui[20691]: Thread started.
Feb 6 14:45:31 vostro fingerprint-gui[20691]: Starting acquire.
Feb 6 14:45:32 vostro fingerprint-gui[20691]: Need 1 stages.
Feb 6 14:45:32 vostro fingerprint-gui[20691]: Acquire stage 0 waiting...
Feb 6 14:45:37 vostro fingerprint-gui[20691]: Acquire: have image.
Feb 6 14:45:37 vostro fingerprint-gui[20691]: Acquire result 3.
Feb 6 14:45:37 vostro fingerprint-gui[20691]: FP_ENROLL_PASS.
Feb 6 14:45:37 vostro fingerprint-gui[20691]: Acquire stage 0 OK.
Feb 6 14:45:37 vostro fingerprint-gui[20691]: Need 2 stages.
Feb 6 14:45:37 vostro fingerprint-gui[20691]: Acquire stage 1 waiting...
Feb 6 14:45:38 vostro fingerprint-gui[20691]: Acquire failed with error -22.
Feb 6 14:45:38 vostro fingerprint-gui[20691]: Acquire stage 0 waiting...
Feb 6 14:45:40 vostro fingerprint-gui[20691]: Acquire failed with error -22.
Feb 6 14:45:40 vostro fingerprint-gui[20691]: Acquire stage 0 waiting...

syslog shows:

Feb 6 14:45:31 vostro kernel: [ 8713.848752] usb 2-4: reset full-speed USB device number 16 using xhci_hcd
Feb 6 14:45:31 vostro kernel: [ 8713.865597] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880010258500
Feb 6 14:45:31 vostro kernel: [ 8713.865603] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880010258540
Feb 6 14:45:31 vostro kernel: [ 8713.865605] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880010258580
Feb 6 14:45:31 vostro kernel: [ 8713.865606] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800102585c0
Feb 6 14:45:33 vostro kernel: [ 8715.417185] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 15 ep 4 with no TDs queued?
Feb 6 14:45:37 vostro kernel: [ 8719.555654] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 15 ep 4 with no TDs queued?

Seems like after each scan on fingerprint-gui, the reader resets!

BUT, if I test with fprint-demo (version 0.4):

$ sudo apt-get install fprint-demo
$ fprint_demo

It works perfectly! I can enroll several fingers, identify, scan, etc.

There is an open bug at launchpad saying that the problem is on libfprint, but all works on fprint_demo. Maybe libfprint is called differently on fprint_demo and on fingerprint-gui?

https://bugs.launchpad.net/ubuntu/+source/libfprint/+bug/1415348

Any ideas?

thanks!

Rafael

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thanks!

Rafael