[kde] [Bug 500667] New: Session freeze randomly with two wayland sessions

[Alberto]

https://bugs.kde.org/show_bug.cgi?id=500667

            Bug ID: 500667
           Summary: Session freeze randomly with two wayland sessions
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: alberto_bugzilla at protonmail.ch
  Target Milestone: ---

Created attachment 178809
  --> https://bugs.kde.org/attachment.cgi?id=178809&action=edit
journalctl

Short description:
I was working, locked the session to go to lunch, came back and found the
session frozen :O
Sometimes this problem occurs on resume from standby if the laptop goes into
standby attached to the docking station (at home) and wakes up unplugged or
attached to a different docking station (at the office) with different screens,
but in this specific case I did not do this.

Hardware:
    Lenovo T14 2° gen. i5-1135G7 with 48GB DDR and 4k screen (#1)
    Docking DELL WD19TB (usbc/thunderbolt)
    LG 27GR93U UltraGear (displayPort) (#2)
    LG 27UL650 (displayPort) (#3)
    all screens have 4k resolution

Versions: 
    Fedora 40
    Linux T14d.localdomain 6.12.11-100.fc40.x86_64 #1 SMP PREEMPT_DYNAMIC Thu
Jan 23 22:07:15 UTC 2025 x86_64 GNU/Linux
    kwin-wayland-6.3.0-3.fc40.x86_64
    kde-settings-40.1-1.fc40.noarch
    plasma-desktop-6.3.0-1.fc40.x86_64
    systemd-255.16-1.fc40.x86_64
    mesa-libGL-24.1.7-1.fc40.x86_64
    xorg-x11-server-Xorg-1.20.14-36.fc40.x86_64
    xorg-x11-drv-intel-2.99.917-57.20210115.fc40.x86_64

Enviroment:
    - laptop connected directly to the docking station with its thunderbolt
cable
    - 2 wayland sessions with different users: user(uid:1006) and
user1(uid:1000), the problem was with 'user' (uid:1006) which was the active
session
    - many windows opened (firefox, code, dbeaver, zoom, konsole, ...)

Behavior:
    1. I locked the screen, I turn off the external monitors and I gone away
    2. I come back after, the laptop screen was turned off(energy saving)
    3. I moved the mouse (touchpad) and the laptop screen turned on
    4. I turned on the external screen (#2) and (#3)

Issue:
    5. the screen (#2) was turned on but black,
       the laptop and screen (#3) had the background with the session locked,
       no action made the login prompt appear to unlock the session (moving
mouse, typing keys, change session with CTRL+ALT+F7 and then again CTRL-ALT-F8,
...)
       I tried from the other session to unlock the other session with
'loginctl unlock-sessions' but nothing
       in the end, i had to 'loginctl kill-session 19'

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