[kde] [Bug 500498] New: Screen content displayed before lock screen when waking up from sleep

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=500498

            Bug ID: 500498
           Summary: Screen content displayed before lock screen when
                    waking up from sleep
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: unspecified
                OS: Linux
            Status: REPORTED
          Severity: grave
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: kbtr.buffer098 at passinbox.com
  Target Milestone: ---

SUMMARY

Waking up from sleep, the lock screen takes a second to show up and in the
moment, it glitches showing the actual unlocked screen. It's enough time for
whoever wakes up the computer to read a good deal of information before the
lock screen appears, which turns this into a privacy problem.

This is always reproduceable and it does not matter how long you wait between
sleeping and waking up, which could rule out the lock delay. And still, if the
lock delay was what was happening here, the lock screen wouldn't show up asking
for a password anyway.

It happens both under X11 and Wayland. Showing the desktop longer on X11 and on
Wayland just for a fraction of a second, but still showing it.

STEPS TO REPRODUCE
1. Put the computer to sleep (either by clicking the sleep button, or closing
the laptop lid, it doesn't matter).
2. Wait a bit, to ensure the computer fully goes to sleep. I wait for my laptop
power led to start blinking, you can also go away for a few hours, it makes no
difference.
3. Wake the computer up, by pressing any key or opening the laptop lid.

OBSERVED RESULT

- The laptop wakes up.
- The "contents" of the screen are visible for a moment.
- The lock screen covers everything and I'm required to type my password.

EXPECTED RESULT

- The laptop wakes up.
- Either:
    - The lock screen shows up right away, without allowing for any glitching.
    - If the lock screen takes a moment to show up, the screen should be blank.

SOFTWARE/OS VERSIONS

KDE Plasma Version: 6.3.1
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2

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