fingerprint scanner usually keeps flashing after use, requiring a second (useless) fingerprint scan

Bug #1588815 reported by Christopher Barrington-Leigh on 2016-06-03
This bug affects 13 people
Affects Status Importance Assigned to Milestone
fprintd (Ubuntu)

Bug Description

After upgrade to 16.04, any action which invokes the fingerprint scanner (for me: unlocking screen, sudo, etc) will cause the scanner to flash its green light until I scan my finger. Then the desired authentication and action take place.

However, the scanner continues to flash its green light until I scan my finger a second time. However, this scan accomplishes nothing except to make it stop flashing.

Also, when I log in (with my password, not fingerprint, otherwise I won't have access to encrypted folders), the scanner flashes needlessly until I scan once.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: fprintd 0.6.0-1
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Jun 3 08:55:32 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-02-12 (111 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: fprintd
UpgradeStatus: Upgraded to xenial on 2016-05-24 (9 days ago)

summary: - fingerprint scanner usually keeps flashing after use; requiring a second
- (meaningless) fingerprint scan
+ fingerprint scanner usually keeps flashing after use, requiring a second
+ (useless) fingerprint scan
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in fprintd (Ubuntu):
status: New → Confirmed
Andre T (wind-kitesurfer) wrote :

Same here

Even with 4.6 kernel.
I've tried both figerpritgui ( and fprint (

It is not a major issue for me but still it is annoying that the keeps flashing after authentication occurs

Ubuntu 16.04
Lenovo T450


Changed in fprintd (Ubuntu):
importance: Undecided → Medium
John LaRocque (jwlarocque) wrote :

I am also experiencing this bug, both fingerprintgui and fprint. It's not much of a problem (weird mouse focus issues) but it would be nice to have a fix.
16.04, kernel 4.6.3
Lenovo T460

+1 Also having this issue.

Ubuntu 16.04, kernel 4.4.0
Lenovo X250

Oleg (oleg-tarassov) wrote :

+1 having same issue where light remains flashing after i login using the finger print or via keyboard entered password. Work around is to pass the finger over it once again to stops it.


P.S kernel: 4.7.7-200

Dennis Tang (dennistang) wrote :

+1 as well.

Ubuntu 16.04, 4.4.0-43
Lenovo T460

db (dvb7836) wrote :


Ubuntu 16.04 4.4.0-45-generic
Lenovo T460

menie (menie482) wrote :

Same for me.
Does anyone find a solution?

Ubuntu 16.04 4.4.0-45-generic
X1 Carbon 3rd Gen.

Botond (botond88) wrote :

Same here. Ubuntu 16.04 on a Lenovo x260

Kacper Kulczak (magikis) wrote :

Same here ubuntu 16.04 on Lenovo X1 Carbon 3rd generation

Robert May (robotmay) wrote :

Also present on 16.04 on a ThinkPad X250.

Dalibor Kovač (hogar1977) wrote :

Also present on 16.10, Thinkpad W550s

sapotacoin (sapotacoin) on 2018-06-26
Changed in fprintd (Ubuntu):
status: Confirmed → Fix Released
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