https://bugs.kde.org/show_bug.cgi?id=482179
Bug ID: 482179
Summary: KScreenLocker freezes if fingerprint login is enabled
after laptop is put to sleep
Classification: Plasma
Product: kscreenlocker
Version: 5.27.10
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: swiftlo...@gmail.com
Target Milestone: ---
SUMMARY
This bug, devastating to usability, causes complete session loss if extreme
care is not taken at the lock screen. I'm able to reproduce on both Arch and
Kubuntu 23.10, meaning it's not a distro-specific issue.
STEPS TO REPRODUCE
1. Enable fingerprint unlocking. This in itself is an ordeal on Plasma and is
distro-dependent, usually involving modifying configuration files with root.
2. Engage the lock screen, either by locking the computer or putting it in
sleep mode and waking it up.
3. After engaging the lock screen, put the computer to sleep *without unlocking
the screen*.
4. Wake the computer up.
OBSERVED RESULT
KScreenLocker loses the ability to unlock the screen. The "unlock with
fingerprint" dialogue is still present (but if it timed out before it was put
to sleep, the "timed out" dialogue is still present instead.) However,
unlocking with a fingerprint is no longer possible; nothing happens if one
tries. Unlocking with a password is no longer possible either; the password
prompt can still be input, but clicking on the "enter" key or pressing the
enter button does nothing.
Switching to a TTY, logging in, and typing "loginctl unlock-session" has no
effect. KScreenLocker remains frozen.
EXPECTED RESULT
KScreenLocker remains functional after going to sleep and waking up.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 23.10
(available in About System)
KDE Plasma Version: 5.27.10
KDE Frameworks Version: 5.110.10
Qt Version: 5.15.10
ADDITIONAL INFORMATION
In practice, this causes a complete loss of session, including loss of any open
data, unless precise care is taken; the user **must** unlock the computer
**every time** they wake it from sleep. Opening a laptop lid then immediately
closing it again causes data loss.
I've lost a couple sessions this way in the last ~1.5 years. I was convinced
that switching to Kubuntu might resolve the bug; after discovering it was still
present I decided to file a report here.
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