https://bugs.kde.org/show_bug.cgi?id=525593
Bug ID: 525593
Summary: KScreenLocker on X11 rejects password containing î on
French keyboard while Wayland, SDDM and PAM accept it
Classification: Plasma
Product: plasmashell
Version First 6.6.6
Reported In:
Platform: Kubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Screen locking
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: 1.0
DESCRIPTION
KScreenLocker on X11 rejects my password when it contains the character î,
entered on a French keyboard using the dead key ^ followed by i.
The same password works in SDDM, with pamtester kde, and in a Plasma Wayland
session.
STEPS TO REPRODUCE
1. Use a password containing î with a French keyboard layout.
2. Lock the session with loginctl lock-session.
3. Enter the correct password in KScreenLocker.
OBSERVED RESULT
KScreenLocker rejects the password.
The journal contains:
unix_chkpwd: password check failed
pam_unix(kde:auth): authentication failure
EXPECTED RESULT
KScreenLocker should accept the same password that is accepted by SDDM and PAM.
SOFTWARE/OS VERSIONS
Operating System: Kubuntu 26.04 LTS
KDE Plasma Version: 6.6.6
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.2
Graphics Platform: X11
ADDITIONAL INFORMATION
Kernel Version: 7.0.0-31-generic (64-bit)
Keyboard layout: fr
pamtester kde "$USER" authenticate succeeds with the same password.
A password containing only simple ASCII characters works in KScreenLocker.
Replacing only the î character in the original password also makes
KScreenLocker authentication succeed.
The issue reproduces with a simple session lock; suspend/resume is not
required.
The issue appears to be X11-specific.
With the same password containing "î":
- Plasma X11 session: KScreenLocker rejects the password.
- Plasma Wayland session: KScreenLocker accepts the password.
SDDM and direct PAM authentication accept the password in both cases.
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