https://bugs.kde.org/show_bug.cgi?id=521169
Bug ID: 521169
Summary: SDDM (Breeze/OpenSUSE) theme authentication fails on
multi-monitor setup; user list becomes inconsistent
Classification: Plasma
Product: plasma-login-manager
Version First 6.6.5
Reported In:
Platform: openSUSE
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Target Milestone: ---
Environment
- openSUSE Tumbleweed (fully updated)
- sddm-qt6 0.21.0
- plasma6-workspace 6.6.5
- Qt 6.11.1
- SDDM running on X11
- Plasma session running on Wayland
- 3 monitors connected
Important note:
The problem has only been tested with SDDM running on X11. Native SDDM Wayland
mode was not tested because it is still considered experimental on openSUSE
Tumbleweed. Therefore it is currently unknown whether the issue also occurs
when SDDM itself runs under Wayland.
Description
With three monitors active during SDDM startup, authentication behaves
incorrectly. The user list displays both users correctly, but only one user can
authenticate successfully. Selecting the other user from the user list results
in an authentication failure and SDDM reports a wrong password although the
password is correct.
Using "Other User" and manually entering the username allows a successful
login.
After logout, that manually entered user becomes the only user that can
successfully authenticate from the user list.
The behaviour effectively alternates between users depending on who last logged
in via "Other User".
Journal output contains:
qrc:/qt/qml/org/kde/breeze/components/UserList.qml:32:
TypeError: Cannot read property 'userName' of null
Workarounds
1. Disable the user list completely.
2. Disable secondary monitors in the SDDM X11 configuration so that only one
monitor is active during login.
After login, Plasma Wayland starts normally and all three monitors work
correctly.
Steps to reproduce
1. Use Breeze or breeze-openSUSE SDDM theme or any other theme with
user-preselection.
2. Connect three monitors.
3. Boot into SDDM.
4. Select a user from the user list.
5. Enter the correct password.
6. Authentication may fail.
7. Use "Other User" and manually enter the username.
8. Authentication succeeds.
9. Logout and test the other user again.
Expected result
All users displayed in the user list authenticate correctly.
Actual result
Authentication depends on the last manually entered username and the user list
appears to become internally inconsistent.
Additional information
The issue disappears immediately when only one monitor is active in SDDM.
The issue does not affect the Plasma Wayland session itself after login.
Already mentioned behaviour in KDE Bug 494804.
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