https://bugs.kde.org/show_bug.cgi?id=370676

            Bug ID: 370676
           Summary: Screenlock: no input widgets, loginctl unlock-session
                    not working
           Product: plasmashell
           Version: master
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: k...@davidedmundson.co.uk
          Reporter: t...@iki.fi
                CC: bhus...@gmail.com, plasma-b...@kde.org

Sometimes there is no input widgets at all visible in the lock screen,
requiring unlocking through loginctl. I have seen this happening for a while,
but it's been possible to use "loginctl unlock-session" to get the desktop
back.

However, although since the new lock screen / Plasma 5.8 doing unlock-session
doesn't work anymore, unlock-session_s_ (plural) & inputing the root password
lets me still access the desktop.


Reproducible: Sometimes

Steps to Reproduce:
1. Lock the screen
2. Realize that there's no place to input the password
3. Try to unlock through loginctl unlock-session


Actual Results:  
1. Unable to lock screen without swithing to console & calling loginctl
unlock-sessions

Expected Results:  
In the best case there'd be password field for input (like it does now and
then).
Even if not, loginctl unlock-session should unlock the session, without a need
to resort to unlock-sessions which require root. (This part may be a mistake in
my configuration though)

X.org, Intel, multihead setup:
[    37.213] (II) intel(0): Using Kernel Mode Setting driver: i915, version
1.6.0 20160425
[    37.213] (II) intel(0): SNA compiled from 2.99.917-711-gbd33d0a
[    37.214] (WW) Falling back to old probe method for modesetting
[    37.214] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card
support
[    37.214] (--) intel(0): Integrated Graphics Chipset: Intel(R) HD Graphics
4600
[    37.214] (--) intel(0): CPU: x86-64, sse2, sse3, ssse3, sse4.1, sse4.2,
avx, avx2; using a maximum of 4 threads

Locking the screen + switching to VT + doing the unlock produces the following
log:
[ 98198.863] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 98199.305] (II) systemd-logind: got pause for 13:72
[ 98199.305] (II) systemd-logind: got pause for 226:0
[ 98199.305] (II) systemd-logind: got pause for 13:85
[ 98199.305] (II) systemd-logind: got pause for 13:73
[ 98199.305] (II) systemd-logind: got pause for 13:81
[ 98199.305] (II) systemd-logind: got pause for 13:66
[ 98199.305] (II) systemd-logind: got pause for 13:65
[ 98199.305] (II) systemd-logind: got pause for 13:67
[ 98199.305] (II) systemd-logind: got pause for 13:70
[ 98199.305] (II) systemd-logind: got pause for 13:74
[ 98199.305] (II) systemd-logind: got pause for 13:80
[ 98199.305] (II) systemd-logind: got pause for 13:69
[ 98199.305] (II) systemd-logind: got pause for 13:64
[ 98199.305] (EE) xf86OpenSerial: Cannot open device /dev/input/event17
        Permission denied.
[ 98199.305] (WW) synaptics: SynPS/2 Synaptics TouchPad: cannot open input
device
[ 98199.305] [dix] couldn't enable device 15
[ 98209.093] (II) systemd-logind: got resume for 13:72
[ 98209.093] (II) systemd-logind: got resume for 226:0
[ 98209.093] (II) Open ACPI successful (/var/run/acpid.socket)
[ 98209.093] (II) AIGLX: Resuming AIGLX clients after VT switch
[ 98209.093] (II) intel(0): switch to mode 2560x1440@60.0 on DP2-1 using pipe
1, position (0, 0), rotation normal, reflection none
[ 98209.153] (II) intel(0): switch to mode 1920x1200@60.0 on DP2-2 using pipe
2, position (2560, 0), rotation normal, reflection none
[ 98209.455] (EE) intel(0): sna_mode_shutdown_crtc: invalid state found on pipe
0, disabling CRTC:26
[ 98210.605] (II) systemd-logind: got resume for 13:85
[ 98210.605] (II) systemd-logind: got resume for 13:73
[ 98210.605] (II) systemd-logind: got resume for 13:81
[ 98210.605] (II) systemd-logind: got resume for 13:66
[ 98210.606] (II) systemd-logind: got resume for 13:65
[ 98210.606] (II) systemd-logind: got resume for 13:67
[ 98210.606] (II) systemd-logind: got resume for 13:70
[ 98210.606] (II) systemd-logind: got resume for 13:74
[ 98210.606] (II) systemd-logind: got resume for 13:80
[ 98210.607] (II) systemd-logind: got resume for 13:69
[ 98210.607] (II) systemd-logind: got resume for 13:64


Archlinux with recent Plasma.
Plasmashell: 5.8.1 (missing version btw)

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