Hello,

I am running KDE Neon with latest updates (Plasma 5.8.3 at this moment). Every time I start a new session, when I return to the initial one (ctrl+alt+F7) I get black screen saying that screen locker is broken and I should go to virtual terminal and run

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loginctl unlock-sessions

Here is content of ~/.xsession-errors

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lock called
Lock window Id:  25165846
CreateNotify: 25165846
UnmapNotify: 25165846
CreateNotify: 46137347
CreateNotify: 46137350
CreateNotify: 46137352
CreateNotify: 46137354
CreateNotify: 46137356
MapNotify: 46137354
MapNotify: 25165846
CreateNotify: 46137358
powerdevil: ACTIVE SESSION PATH CHANGED: "/"
powerdevil: Switched to inactive session - leaving unchanged
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kscreenlocker_greet path = /usr/lib/x86_64-linux-gnu/libexec pid = 2092
KCrash: Arguments: /usr/lib/x86_64-linux-gnu/libexec/kscreenlocker_greet --immediateLock --graceTime 5000 --ksldfd 73
UnmapNotify: 46137354
UnmapNotify: 25165835
UnmapNotify: 25165835
powerdevil: ACTIVE SESSION PATH CHANGED: "/org/freedesktop/login1/session/_33"
powerdevil: Current session is now inactive
CreateNotify: 46137347
CreateNotify: 46137350
CreateNotify: 46137352
CreateNotify: 46137354
CreateNotify: 46137356
MapNotify: 46137354
uhoh! duplicate!
uhoh! duplicate!
CreateNotify: 46137358
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kscreenlocker_greet path = /usr/lib/x86_64-linux-gnu/libexec pid = 2154
KCrash: Arguments: /usr/lib/x86_64-linux-gnu/libexec/kscreenlocker_greet --immediateLock --graceTime 5000 --ksldfd 64
UnmapNotify: 46137354
CreateNotify: 46137347
CreateNotify: 46137350
CreateNotify: 46137352
CreateNotify: 46137354
CreateNotify: 46137356
MapNotify: 46137354
uhoh! duplicate!
uhoh! duplicate!
CreateNotify: 46137358
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kscreenlocker_greet path = /usr/lib/x86_64-linux-gnu/libexec pid = 2174
KCrash: Arguments: /usr/lib/x86_64-linux-gnu/libexec/kscreenlocker_greet --immediateLock --graceTime 5000 --ksldfd 64
UnmapNotify: 46137354
QXcbConnection: XCB error: 3 (BadWindow), sequence: 15555, resource id: 46137354, major code: 20 (GetProperty), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 15556, resource id: 46137354, major code: 20 (GetProperty), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 15557, resource id: 46137354, major code: 20 (GetProperty), minor code: 0
CreateNotify: 56623107
CreateNotify: 56623110
CreateNotify: 56623112
CreateNotify: 56623114
CreateNotify: 56623116
MapNotify: 56623114
CreateNotify: 56623118
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kscreenlocker_greet path = /usr/lib/x86_64-linux-gnu/libexec pid = 2183
KCrash: Arguments: /usr/lib/x86_64-linux-gnu/libexec/kscreenlocker_greet --immediateLock --graceTime 5000 --ksldfd 64
UnmapNotify: 56623114
powerdevil: ACTIVE SESSION PATH CHANGED: "/org/freedesktop/login1/session/_34"
powerdevil: Current session is now inactive
powerdevil: ACTIVE SESSION PATH CHANGED: "/org/freedesktop/login1/session/_32"
powerdevil: Current session is now active
powerdevil: Can't contact ck
powerdevil: We are now into activity  "6bcf02db-444e-4ca6-96f8-9d206adb7798"
powerdevil: () ()
powerdevil: () ()
powerdevil: Loading profile for plugged AC
powerdevil: Activity is not forcing a profile
powerdevil:
powerdevil: Loading timeouts with  600000
CreateNotify: 56623107
kdeinit5: Got SETENV 'KDE_MULTIHEAD=false' from launcher.
CreateNotify: 58720259
Initializing  "kcm_input" :  "kcminit_mouse"
kdeinit5: Got SETENV 'XCURSOR_THEME=breeze_cursors' from launcher.
CreateNotify: 56623112
QXcbConnection: XCB error: 3 (BadWindow), sequence: 16761, resource id: 56623112, major code: 18 (ChangeProperty), minor code: 0
kdeinit5: Got SETENV 'KDE_MULTIHEAD=false' from launcher.
Initializing  "kcm_input" :  "kcminit_mouse"
kdeinit5: Got SETENV 'XCURSOR_THEME=breeze_cursors' from launcher.
CreateNotify: 58720264
QXcbConnection: XCB error: 3 (BadWindow), sequence: 16950, resource id: 58720264, major code: 18 (ChangeProperty), minor code: 0
powerdevil: ACTIVE SESSION PATH CHANGED: "/"
powerdevil: Switched to inactive session - leaving unchanged
powerdevil: ACTIVE SESSION PATH CHANGED: "/org/freedesktop/login1/session/_35"
powerdevil: Current session is now inactive
Grab Released
powerdevil: ACTIVE SESSION PATH CHANGED: "/org/freedesktop/login1/session/_32"
powerdevil: Current session is now active
powerdevil: Can't contact ck
powerdevil: We are now into activity  "6bcf02db-444e-4ca6-96f8-9d206adb7798"
powerdevil: () ()
powerdevil: () ()
powerdevil: Loading profile for plugged AC
powerdevil: Activity is not forcing a profile
powerdevil:
powerdevil: Loading timeouts with  600000
kdeinit5: Got SETENV 'KDE_MULTIHEAD=false' from launcher.
Initializing  "kcm_input" :  "kcminit_mouse"
kdeinit5: Got SETENV 'XCURSOR_THEME=breeze_cursors' from launcher.
QXcbConnection: XCB error: 3 (BadWindow), sequence: 17902, resource id: 56623112, major code: 18 (ChangeProperty), minor code: 0
kdeinit5: Got SETENV 'KDE_MULTIHEAD=false' from launcher.
Initializing  "kcm_input" :  "kcminit_mouse"
kdeinit5: Got SETENV 'XCURSOR_THEME=breeze_cursors' from launcher.
QXcbConnection: XCB error: 3 (BadWindow), sequence: 18424, resource id: 56623112, major code: 18 (ChangeProperty), minor code: 0

Any ideas how to fix the problem?

Thanks.

My roomate just had the same thing happen on her laptop. lol she freaked out. I ran the same command it said to run, and she hasn't had the issue since. She wasn't in virtual or doing anything other than the normal screen locking when it occurred. I shrugged, blew it off (meh..... linux ), and moved on. I suppose if it is occurring across the board with others, could be a slight bug.
Maybe file a bug report.

I have submitted new bug report to KDE team here:
https://bugs.kde.org/show_bug.cgi?id=372275

Anyone having same issue please comment there so that devs know how many people have the bug and maybe have more motivation to solve it.