** Changed in: libfprint-2-tod1-broadcom
Status: New => Confirmed
** Changed in: libfprint-2-tod1-broadcom
Importance: Undecided => Critical
** Changed in: libfprint-2-tod1-broadcom
Assignee: (unassigned) => Andy Chi (andch)
** Also affects: libfprint (Ubuntu)
Importance: Undecided
Status: New
** Tags added: oem-priority originate-from-1985872 somerville
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https://bugs.launchpad.net/bugs/1956885
Title:
Incorrect verify implementation, unable to verify on one finger
Status in libfprint-2-tod1-broadcom:
Confirmed
Status in OEM Priority Project:
New
Status in libfprint package in Ubuntu:
Confirmed
Bug description:
The closed-source library blocks on synchronous USB transfers in its "verify"
method (at least, there might be others with the same issue).
The "identify" one is correct (asynchronous).
As a result :
$ fprintd-verify
Using device /net/reactivated/Fprint/Device/0
Listing enrolled fingers:
- #0: right-index-finger
(finger pressed)
Verify started!
Verifying: right-index-finger
(blocked)
"Verify started!" should happen immediately, but the code libfprint code
waits for fp_device_verify to return, which only happens when the finger is
pressed with this driver.
The verify success message is sent during the call, so it is ignored.
"fprintd-verify -f any" and pam-fprintd use fp_device_identify, so they work
correctly.
But with https://gitlab.freedesktop.org/libfprint/fprintd/-/commit/fc65055279
(so I suppose on jammy), the "verify" method will be used instead if only one
finger is enrolled.
TL,DR: the fingerprint reader appears to mostly work on focal, but
starting with jammy it won't unless at least two fingers are enrolled.
Note that this is tested on a Dell Latitude 5521, but the issue should
be the same with all Broadcom fingerprint readers using this library.
Duplicate bug #1981974
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