Public bug reported:

[Impact]

On Ubuntu 20.04, with Synaptics fingerprint reader, users can use one
fingerprint to login system, but if users add more fingerprints, they
still can only one of those to login, other fingerprints do not work.

To fix this issue, we need support fingerprint identification in the driver of 
Synaptics fingerprint reader, by backport this libfprint commit to Focal:
https://gitlab.freedesktop.org/libfprint/libfprint/commit/e27b65c9

[Test Case]

I tried backport the commit above to libfprint
(1:1.90.2+tod1-0ubuntu1~20.04.2) in Focal and tested on 3 ThinkPads(both
use the 06cb:00bd Synaptics fingerprint reader), the multiple
fingerprints works well.

We have other OEM platforms with Synaptics fingerprint reader, we can
use it to validate the changes if needed.

[Regression Potential]

the commit comes from Synaptics' engineer, just affects one file:
libfprint/drivers/synaptics/synaptics.c, and only add identification
support in that file, so the regression potential should be low.

** Affects: oem-priority
     Importance: High
     Assignee: Shengyao Xue (xueshengyao)
         Status: In Progress

** Affects: libfprint (Ubuntu)
     Importance: High
     Assignee: Marco Trevisan (Treviño) (3v1n0)
         Status: In Progress


** Tags: oem-priority originate-from-1903502 sutton

** Changed in: oem-priority
   Importance: Undecided => High

** Changed in: oem-priority
     Assignee: (unassigned) => Shengyao Xue (xueshengyao)

** Also affects: libfprint (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: oem-priority
       Status: New => In Progress

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Desktop Bugs, which is subscribed to libfprint in Ubuntu.
https://bugs.launchpad.net/bugs/1905600

Title:
  Support fingerprint identification in the driver of Synaptics
  fingerprint reader

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