[kscreenlocker] [Bug 490924] The first password attempt is rejected after system wakes from sleep.

https://bugs.kde.org/show_bug.cgi?id=490924

Hinokami Dev <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]

--- Comment #41 from Hinokami Dev <[email protected]> ---
## Summary

I am experiencing what appears to be the same KScreenLocker/PAM suspend-resume
issue described in this bug.

When my system is locked and then suspended, KScreenLocker reports a failed
authentication immediately after resume, even though I have not entered my
password at all. The lock screen shakes and displays **"Unlocking failed"**
automatically.

### Steps to reproduce

1. Lock the system using `Meta+L`.
2. Leave the system locked until it goes to sleep/suspend automatically.
3. Wake the system using the power button on the keyboard.
4. Observe the lock screen before entering any password.

### Observed behavior

Immediately after waking:

* The lock screen shakes as if an incorrect password was entered.
* **"Unlocking failed"** is displayed.
* No password has been entered.
* After this automatic failure, entering the correct password works normally.

I can also reproduce the issue when using the **Sleep** button directly from
the lock screen.

### Expected behavior

After resuming from suspend, the lock screen should simply wait for my
password. It should not report a failed authentication when no authentication
attempt was made.

### System information

* Fedora Linux 44
* KDE Plasma 6.7.4
* KDE Frameworks: [please add output]
* KScreenLocker: `6.7.4-1.fc44`
* Qt: [please add output]
* Kernel: [please add output]
* Graphics platform: Wayland
* PAM: `1.7.2-2.fc44`
* Architecture: x86_64

### Additional information

This is not simply an incorrect-password issue. The failure occurs
automatically immediately after resume, before I enter anything.

If I lock the system and unlock it without suspending, the password is accepted
normally. The problem is specifically associated with suspend/resume while the
system is locked.

I found an existing KDE bug discussing very similar behavior, including
`PAM_CONV_ERR` and cancellation of the PAM authentication conversation when
suspending from the lock screen. The discussion also references MR 340 as a
possible fix.

I am reporting this because the issue still appears to be reproducible on
Fedora 44 with KScreenLocker 6.7.4.

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