[Bug 1817897] Re: attempting to enable fingerprint with pam-auth-update breaks gdm

[Jonathan Kamens]

I have a new Thinkpad X1 Carbon 6th generation. I can see the
fingerprint reader right next to the trackpad, and the specs say that it
has one, but I don't see it showing up in the output of lspci or lsusb.
Maybe I'm missing it? Maybe it's not supported? Or maybe there's a
hardware issue? I'm not sure how to tell.

lsusb output:

Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 002: ID 0bda:0328 Realtek Semiconductor Corp. 
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 06cb:009a Synaptics, Inc. 
Bus 001 Device 005: ID 04f2:b614 Chicony Electronics Co., Ltd 
Bus 001 Device 004: ID 8087:0a2b Intel Corp. 
Bus 001 Device 003: ID 04f2:b615 Chicony Electronics Co., Ltd 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to pam in Ubuntu.
https://bugs.launchpad.net/bugs/1817897

Title:
  attempting to enable fingerprint with pam-auth-update breaks gdm

Status in pam package in Ubuntu:
  New

Bug description:
  I ran sudo pam-auth-update, enabled "Fingerprint authentication",
  selected "OK", and then rebooted.

  GDM wouldn't start after the reboot:

  Feb 27 06:29:41 jik-x1 /usr/lib/gdm3/gdm-wayland-session[1551]: dbus-daemon[1553]: [session uid=121 pid=1553] Activating service name='org.freedesktop.systemd1' requested by ':1.0' (uid=121 pid=1551 comm="/usr/lib/gdm3/gdm-wayland-session gnome-session --" label="unconfined")
  Feb 27 06:29:41 jik-x1 /usr/lib/gdm3/gdm-wayland-session[1551]: dbus-daemon[1553]: [session uid=121 pid=1553] Activated service 'org.freedesktop.systemd1' failed: Process org.freedesktop.systemd1 exited with status 1
  Feb 27 06:29:41 jik-x1 /usr/lib/gdm3/gdm-wayland-session[1551]: Unable to register display with display manager

  I logged in on a VT and ran pam-auth-update again. I observed that
  "Register user sessions in the systemd control group" was not
  selected, even though my recollection was that it had been selected
  before I enabled fingerprint authentication, and I didn't disable it.

  I unselected fingerprint authentication and selected "Register user
  sessions in the systemd control group" and rebooted again. GDM started
  working again.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: libpam-runtime 1.3.1-5ubuntu1
  ProcVersionSignature: Ubuntu 4.19.0-13.14-generic 4.19.20
  Uname: Linux 4.19.0-13-generic x86_64
  ApportVersion: 2.20.10-0ubuntu21
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Feb 27 06:31:32 2019
  InstallationDate: Installed on 2019-02-26 (0 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  PackageArchitecture: all
  SourcePackage: pam
  UpgradeStatus: Upgraded to disco on 2019-02-26 (0 days ago)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/pam/+bug/1817897/+subscriptions