Public bug reported:
[ Issue ]
* Ubuntu 24.04.3 gnome-shell 46.0-0ubuntu6~24.04.12 (Also tested Ubuntu 26)
* At gdm login screen insert smartcard for smartcard authentication
Expected: gdm shall prompt for pin
Actual: gdm displays a disabled input box with no text (need to press back
button to "reset" and then gdm prompts for Username, press [Enter], then gdm
prompts for PIN, see recording [1]. Also an unhandled promise rejection can be
found in the log attached
Stack trace of the failed promise:
_startService@resource:///org/gnome/shell/gdm/util.js:926:24
...
[ Test Plan ]
* Follow steps in test plan https://wiki.ubuntu.com/DesktopTeam/TestPlans/GDM
* For smartcard I suggest
1. Configure setup with smart card authentication following this tutorial
2. Ensure smart cart authentication works, plugging in the card both before and
after gdm has been started following
1. Insert smartcard (before and after gdm started)
2. gdm shall prompt for PIN
3. Enter correct PIN
4. Successful login
3. Once logged in, unlocking the screen should work with smart card
[ Regression ]
* gdm issue may be related to introduced Ubuntu patches, this issue does not
exist in Debian 13, some more details in [2]
* Unnecessary prompting for Username may be related to pam config, see [3] and
may also be tracked in [3] but the user experience is affected by this (works
as expected on example Fedora, Debian has same issue)
[ Other info ]
* Links:
[1] - Recording of issue https://drive.proton.me/urls/V723E5TS2C#bqYHCv8w0Va6
[2] - My Launchpad question on the issue with patch workaround
https://answers.launchpad.net/ubuntu/+source/gnome-shell/+question/823369
[3] - gdm-smartcard pam config denies legitimate users, prompts for username
https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1986750
** Affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "log"
https://bugs.launchpad.net/bugs/2138543/+attachment/5939589/+files/gdm.log
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https://bugs.launchpad.net/bugs/2138543
Title:
Smartcard authentication broken: gnome-shell throws on unhandled
promise rejection
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