https://bugs.kde.org/show_bug.cgi?id=499383
--- Comment #64 from François Guerraz <kubr...@fgv6.net> ---
Ok, I just tested again, these are my exact steps, without adding widgets, I
deleted the user's home directory and stared from scratch.
* Log in for the first time, with my laptop sitting on the right hand side of
the external display, main panel with the start menu is on the external
display.
* Go to display configuration
* move displays around so that the laptop monitor is on the right hand side of
the external display
* change external display scale 125%->100%, change built-in display scale
225%->200%
* set external display to Primary
* Apply
For some reason, this moves the panel to the built-in display (not primary), so
right-click on the desktop and enter edit mode
* Click on the panel, click clone panel, position the panel on the external
display
* Delete the panel on the built-in display
Exit edit mode. Lock the display, press Esc so that monitors switch off, wait
for complete switch off, wake up, log-in, crash:
#4 0x0000708c6744bcd0 in <signal handler called> () at /usr/lib/libc.so.6
#5 QWindow::screen (this=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/gui/kernel/qwindow.cpp:2240
d = 0x74006e0065006e
#6 0x0000708c683d3d2c in QPlatformWindow::screen
(this=this@entry=0x5da1336efe60) at
/usr/src/debug/qt6-base/qtbase/src/gui/kernel/qplatformwindow.cpp:70
scr = <optimized out>
#7 0x0000708c68cad3ea in
QtWaylandClient::QWaylandWindow::calculateScreenFromSurfaceEvents
(this=this@entry=0x5da1336efe50) at
/usr/src/debug/qt6-wayland/qtwayland/src/client/qwaylandwindow.cpp:570
lock = {q_val = 102946934029953}
#8 0x0000708c68cb343a in QtWaylandClient::QWaylandWindow::handleScreensChanged
(this=0x5da1336efe50) at
/usr/src/debug/qt6-wayland/qtwayland/src/client/qwaylandwindow.cpp:1426
newScreen = <optimized out>
#9 0x0000708c67bb6cc9 in QtPrivate::QSlotObjectBase::call
(this=0x5da133607830, r=0x5da1336efe50, a=0x7ffee59308d8, this=<optimized out>,
r=<optimized out>, a=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobjectdefs_impl.h:461
#10 doActivate<false> (sender=<optimized out>, signal_index=<optimized out>,
argv=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobject.cpp:4138
obj = {m_slotObject = std::unique_ptr<class QtPrivate::QSlotObjectBase>
= {get() = 0x5da133607830}}
receiver = 0x5da1336efe50
td = <optimized out>
receiverInSameThread = <optimized out>
senderData = {previous = 0x0, receiver = 0x5da1336efe50, sender =
0x5da1336ee820, signal = 3}
c = 0x5da13350faf0
connections = {d = {ptr = <optimized out>}}
list = <optimized out>
inSenderThread = <optimized out>
highestConnectionId = <optimized out>
signalVector = 0x5da133a6bae0
currentThreadId = <optimized out>
sp = <optimized out>
signal_spy_set = 0x0
empty_argv = {0x0}
senderDeleted = false
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