https://bugs.kde.org/show_bug.cgi?id=510323
Bug ID: 510323
Summary: powerdevil crashes in
KScreen::WaylandOutputDevice::kde_output_device_v2_mod
e() after waking up system with different number of
screens
Classification: Plasma
Product: kwin
Version First 6.5.80
Reported In:
Platform: KDE Linux
OS: Linux
Status: REPORTED
Keywords: multiscreen
Severity: crash
Priority: NOR
Component: output configuration
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
STEPS TO REPRODUCE
1. Have two screens (Laptop: 2880x1800 @ 175% + desktop: 2560x1440 @ 100%)
2. Put the computer to sleep using Kickoff > Sleep
3. Some time later, while the laptop is still asleep, close the lid and unplug
the external screen
4. A very short time later, open the laptop lid to wake it up, and unlock the
lock screen
OBSERVED RESULT
powerdevil crashes with a message saying "KWaylandBackend: no output modes
available anymore, this seems like a compositor bug"
Full backtrace:
Thread 1 (Thread 0x7fd878371b00 (LWP 286149)):
[KCrash Handler]
#4 __pthread_kill_implementation (threadid=<optimized out>, signo=6,
no_tid=<optimized out>) at pthread_kill.c:44
#5 0x00007fd87d24d410 in __GI_raise (sig=6) at ../sysdeps/posix/raise.c:26
#6 0x00007fd87d23457a in __GI_abort () at abort.c:77
#7 0x00007fd87da19217 in qAbort () at
/usr/src/debug/qt6-base/qtbase/src/corelib/global/qassert.cpp:46
#8 qt_message_fatal<QString&> (context=..., message=...) at
/usr/src/debug/qt6-base/qtbase/src/corelib/global/qlogging.cpp:2149
#9 qt_message(QtMsgType, const QMessageLogContext &, const char *, typedef
__va_list_tag __va_list_tag *) (msgType=msgType@entry=QtFatalMsg, context=...,
msg=msg@entry=0x7fd85f7f5528 "KWaylandBackend: no output modes available
anymore, this seems like a compositor bug", ap=ap@entry=0x7fffc687b618) at
/usr/src/debug/qt6-base/qtbase/src/corelib/global/qlogging.cpp:381
#10 0x00007fd87da1a0ec in QMessageLogger::fatal
(this=this@entry=0x7fffc687b870, msg=msg@entry=0x7fd85f7f5528 "KWaylandBackend:
no output modes available anymore, this seems like a compositor bug") at
/usr/src/debug/qt6-base/qtbase/src/corelib/global/qlogging.cpp:883
#11 0x00007fd85f7e4e2f in operator() (__closure=<optimized out>) at
/home/nate/kde/src/libkscreen/backends/kwayland/waylandoutputdevice.cpp:73
#12 operator() (__closure=<optimized out>) at
/usr/include/qt6/QtCore/qobjectdefs_impl.h:116
#13 QtPrivate::FunctorCallBase::call_internal<void,
QtPrivate::FunctorCall<std::integer_sequence<long unsigned int>,
QtPrivate::List<>, void,
KScreen::WaylandOutputDevice::kde_output_device_v2_mode(kde_output_device_mode_v2*)::<lambda()>
>::call(KScreen::WaylandOutputDevice::kde_output_device_v2_mode(kde_output_device_mode_v2*)::<lambda()>&,
void**)::<lambda()> > (args=<optimized out>, fn=...) at
/usr/include/qt6/QtCore/qobjectdefs_impl.h:65
#14 QtPrivate::FunctorCall<std::integer_sequence<long unsigned int>,
QtPrivate::List<>, void,
KScreen::WaylandOutputDevice::kde_output_device_v2_mode(kde_output_device_mode_v2*)::<lambda()>
>::call (f=..., arg=<optimized out>) at
/usr/include/qt6/QtCore/qobjectdefs_impl.h:115
#15
QtPrivate::FunctorCallable<KScreen::WaylandOutputDevice::kde_output_device_v2_mode(kde_output_device_mode_v2*)::<lambda()>
>::call<QtPrivate::List<>, void> (f=..., arg=<optimized out>) at
/usr/include/qt6/QtCore/qobjectdefs_impl.h:337
#16
QtPrivate::QCallableObject<KScreen::WaylandOutputDevice::kde_output_device_v2_mode(kde_output_device_mode_v2*)::<lambda()>,
QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *,
void **, bool *) (which=<optimized out>, this_=<optimized out>, r=<optimized
out>, a=<optimized out>, ret=<optimized out>) at
/usr/include/qt6/QtCore/qobjectdefs_impl.h:547
#17 0x00007fd87db5c66f in QtPrivate::QSlotObjectBase::call (this=<optimized
out>, r=<optimized out>, a=<optimized out>, this=<optimized out>, r=<optimized
out>, a=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobjectdefs_impl.h:461
#18 doActivate<false> (sender=<optimized out>, signal_index=<optimized out>,
argv=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobject.cpp:4157
#19 0x00007fd87b9fdac6 in ffi_call_unix64 () at ../src/x86/unix64.S:104
#20 0x00007fd87b9fa76b in ffi_call_int (cif=cif@entry=0x7fffc687bb30,
fn=fn@entry=0x7fd85f7e5500
<QtWayland::kde_output_device_mode_v2::handle_removed(void*,
kde_output_device_mode_v2*)>, rvalue=<optimized out>, rvalue@entry=0x0,
avalue=avalue@entry=0x7fffc687bc00, closure=closure@entry=0x0) at
../src/x86/ffi64.c:676
#21 0x00007fd87b9fd06e in ffi_call (cif=cif@entry=0x7fffc687bb30,
fn=0x7fd85f7e5500 <QtWayland::kde_output_device_mode_v2::handle_removed(void*,
kde_output_device_mode_v2*)>, rvalue=rvalue@entry=0x0,
avalue=avalue@entry=0x7fffc687bc00) at ../src/x86/ffi64.c:713
#22 0x00007fd87d92748d in wl_closure_invoke
(closure=closure@entry=0x7fd86c005260, target=<optimized out>,
target@entry=0x7fd86c011b60, opcode=opcode@entry=3, data=<optimized out>,
flags=1) at ../wayland-1.24.0/src/connection.c:1241
#23 0x00007fd87d9282e9 in dispatch_event (display=display@entry=0x555885b9d560,
queue=queue@entry=0x555885b9d658) at
../wayland-1.24.0/src/wayland-client.c:1707
#24 0x00007fd87d9286f3 in dispatch_queue (display=0x555885b9d560,
queue=0x555885b9d658) at ../wayland-1.24.0/src/wayland-client.c:1853
#25 wl_display_dispatch_queue_pending (display=0x555885b9d560,
queue=0x555885b9d658) at ../wayland-1.24.0/src/wayland-client.c:2190
#26 0x00007fd87e9d9536 in QtWaylandClient::QWaylandDisplay::flushRequests
(this=<optimized out>) at
/usr/src/debug/qt6-wayland/qtwayland/src/client/qwaylanddisplay.cpp:228
#27 0x00007fd87db49a74 in QObject::event (this=<optimized out>, e=<optimized
out>) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobject.cpp:1432
#28 0x00007fd87daf0678 in QCoreApplication::notifyInternal2
(receiver=0x555885b9d330, event=event@entry=0x7fd868002600) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qcoreapplication.cpp:1106
#29 0x00007fd87daf0a5b in QCoreApplication::sendEvent (receiver=<optimized
out>, event=0x7fd868002600) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qcoreapplication.cpp:1546
#30 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0,
data=0x555885b70070) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qcoreapplication.cpp:1891
#31 0x00007fd87ddcb7f8 in QCoreApplication::sendPostedEvents (receiver=0x0,
event_type=0) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qcoreapplication.cpp:1744
#32 postEventSourceDispatch (s=0x555885b79930) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:246
#33 0x00007fd87c4f9880 in g_main_dispatch (context=0x7fd870000f70) at
../glib/glib/gmain.c:3398
#34 0x00007fd87c4facd7 in g_main_context_dispatch_unlocked
(context=0x7fd870000f70) at ../glib/glib/gmain.c:4249
#35 g_main_context_iterate_unlocked (context=context@entry=0x7fd870000f70,
block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at
../glib/glib/gmain.c:4314
#36 0x00007fd87c4faee5 in g_main_context_iteration (context=0x7fd870000f70,
may_block=1) at ../glib/glib/gmain.c:4379
#37 0x00007fd87ddc7fe2 in QEventDispatcherGlib::processEvents
(this=0x555885b798d0, flags=...) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:399
#38 0x00007fd87dafcca6 in QEventLoop::processEvents (this=0x7fffc687c210,
flags=...) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventloop.cpp:104
#39 QEventLoop::exec (this=0x7fffc687c210, flags=...) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventloop.cpp:186
#40 0x00007fd87daf4d21 in QCoreApplication::exec () at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qcoreapplication.cpp:1449
#41 0x000055584a8671b0 in main (argc=<optimized out>, argv=<optimized out>) at
/home/nate/kde/src/powerdevil/daemon/powerdevilapp.cpp:132
SOFTWARE/OS VERSIONS
Operating System: KDE Linux 2025-09-25
KDE Plasma Version: 6.5.80
KDE Frameworks Version: 6.20.0
Qt Version: 6.9.2
Kernel Version: 6.16.8-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7840U w/ Radeon™ 780M Graphics
Memory: 16 GiB of RAM (14.9 GiB usable)
Graphics Processor: AMD Radeon 780M Graphics
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