Verify result always returning "verify-no-match"

[ov1d1u]

Hi,

Thank you for this driver, I got my fingerprint scanner on a Lenovo M5400 working on Linux. Unfortunately I cannot get the sensor to validate my fingerprint, everytime I get "Verify result: verify-no-match (done)" when I run "fprintd-verify" (of course, I enrolled my fingertip before doing this).

fprint_demo shows a distorted image (http://i.imgur.com/eltf3k4.png) every time I do a fingertip scanning, so I'm asking if not this is the issue.

Anyway, thanks for your work!

[ars3niy]

Hi,

Thank you for testing the driver. This distortion is, of course, sufficient reason for it to never match.

Can you please run fprint_demo with environment variable VFS5011_DEBUGPATH set to some existing directory, something like

mkdir $HOME/vfs5011debug
VFS5011_DEBUGPATH=$HOME/vfs5011debug fprint_demo

then scan the finger several times so that this distortion occurs, and then send me the content of that directory (you can e-mail to ars3n at yandex.ru, for example)?

Arseniy

[andyboeh]

I'm experiencing the same symptoms. Have you already got the debug trace? If not, let me know and I'll send you the debug output.

[sniper7kills]

Anyone have an update on this by chance?

I was playing around with the vfs5011.c driver, and changed the follow:

RESOLUTION = 5,
MEDIAN_FILTER_SIZE = 13,
MAX_OFFSET = 1,
GOOD_OFFSETS_CRITERION = 20,
GOOD_OFFSETS_THRESHOLD = 3

And its working MUCH better for me now.

[Eugeny]

For me, increasing MAX_OFFSET has removed fingerprint image distortions but I still couldn't achieve reliable verification.

[Vince-vd]

Have you guys ever found a good solution for this? I have the same problem with my lenovo t440s and the fingerprint reader is probably the only thing I really miss since switching to ubuntu a few months ago.

Eugeny what did you change the MAX_OFFSET to? Because I don't really see any difference when playing around with the values.

[Eugeny]

@Vince-vd I tried values up to 1000, and it improved the image, but I can't say that it had any effect on the recognition quality

[Vince-vd]

Ok thank you @Eugeny , I'll just keep typing my password then I guess :)

[EAnushan]

I can confirm that this issue is still present. The image is distorted and I can only match every 1/25 attempts.

[elder]

The same problem on Dell Vostro 5470. I can't authenticate using my fingerprint reader.

[ptonelli]

same issue for lenovo x1 carbon gen3

EDIT: actually it matches a few fingerprint if you swype the finger really fast (tried with fprint_demo to see how the fingerprints looked). If the swype is too slow, the image is distorted vertically (the height is a lot bigger than the width)

[marcocamma]

Hi same observation as ptonelli (on the same machine, running debian sid)

[Nestorfish]

With my T550, I noticed the distortion is created by vfs5011_rescale_image(). As I understand it, it tries to compensate for finger swipe speed variation by doing a correlation between the left and right sections of the capture.
Replacing the function with a simple data copy avoids the distortion and allows slow swipe.
@ars3niy Do you have the datasheet or other information to understand what data is effectively present on the "right side" of the capture ?

[ercoppa]

@ars3niy logs with distortions: https://www.dropbox.com/s/1udq3hxg1rmncm5/vfs5011debug.tar.gz
@Nestorfish can you please make a fork with your changes?

[Nestorfish]

@ercoppa Done. As said in the commit message, other tests must be done to try to get better results.

[ercoppa]

Since the driver has been included upstream (https://bugs.freedesktop.org/show_bug.cgi?id=61692), maybe we should move our discussion there. I agree with you that without a datasheet is hard to understand what it is the right fix that needs to be implemented. Right now, at least for me, the driver is not reliable.

[IvanFrederiks]

@ars3niy
Looks like this issue was fixed in upstream repository. fprint-enroll, fprint-verify and fprint_demo work fine with latest ppa build of libfprint (1:0.6.0-git20151216-1-0ppa1~trusty1). Tested on ThinkPad Edge E540.

P.S.
Fingerprint GUI still crashes during enroll after first swipe.

[andyboeh]

You're right, thanks for reporting it here! It works fine on my Arch Linux with libfprint-git. It was actually fixed by this commit: https://cgit.freedesktop.org/libfprint/libfprint/commit/?id=6e8d5cd6a199f83fb5f862a8421f8582608032f5 so it's going to take some time until it reaches stable.

[dr3mro]

I am facing same issue now on Thinkpad x250 with arch linux

[CheesecakeCG]

@dr3mro Yeah, same here on the T450S, I find it really surprising that the sensitivity options are not exposed in a config file.

[Mdubois12]

I am also experiencing this issue on a Thinkpad T450s, anyone have a solution?

[Toxblh]

Maybe too late. But main knowledge here - https://github.com/iafilatov/libfprint#common-problems
You should swipe your finger instead of touch. fprintd used "long" image for that.
So as write - guys also provide "touch" version the driver

[andirsun]

Maybe too late. But main knowledge here - https://github.com/iafilatov/libfprint#common-problems
You should swipe your finger instead of touch. fprintd used "long" image for that.
So as write - guys also provide "touch" version the driver

How can I install the touch version of the driver ?