Bug 425463

Summary: System settings crash when navigate desktop effects
Product: [Applications] systemsettings Reporter: debianick
Component: kcm_kwineffectsAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED FIXED    
Severity: crash CC: edgarmarquez431, nate, plasma-bugs
Priority: NOR Keywords: drkonqi
Version: 5.17.5   
Target Milestone: ---   
Platform: Debian stable   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: New crash information added by DrKonqi

Description debianick 2020-08-17 14:58:56 UTC 
Application: systemsettings5 (5.17.5)

Qt Version: 5.14.2
Frameworks Version: 5.70.0
Operating System: Linux 5.7.0-2-amd64 x86_64
Distribution: Debian GNU/Linux bullseye/sid

-- Information about the crash:
- What I was doing when the application crashed:
I try to open transparency setttings on desktop effects,, the popup opens but i cannot do anything because the popup close immediately.
It happens every time i open it.
I have Maia Transparent installed as Plasma Style.
I change to brisa dark without restarting UI and the problem persist.
I have nvidia drivers installed from package manager.
I'm using debian bullseye from ftp.br.debian.org repository.

-- Backtrace:
Application: Preferencias del sistema (systemsettings5), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fe8c0a0b040 (LWP 31296))]

Thread 6 (Thread 0x7fe8a9d68700 (LWP 31332)):
#0  __GI___libc_read (nbytes=16, buf=0x7fe8a9d67b30, fd=28) at ../sysdeps/unix/sysv/linux/read.c:26
#1  __GI___libc_read (fd=28, buf=0x7fe8a9d67b30, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007fe8c587cf55 in ?? () from /usr/lib/x86_64-linux-gnu/libnvidia-tls.so.340.108
#3  0x00007fe8c605ef4f in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fe8c601733e in g_main_context_check () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fe8c6017792 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fe8c601790f in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007fe8c89ab31b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe8c89544db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fe8c877b8de in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fe8c7a6a3a5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007fe8c877ca01 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007fe8c6ea3ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#13 0x00007fe8c841feaf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fe8b570d700 (LWP 31305)):
#0  0x00007fe8c84154bf in __GI___poll (fds=0x7fe8a40035e0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fe8c60177ee in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe8c601790f in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe8c89ab31b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe8c89544db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe8c877b8de in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe8c7a6a3a5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fe8c877ca01 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe8c6ea3ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007fe8c841feaf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fe8b7def700 (LWP 31304)):
#0  __GI___libc_read (nbytes=16, buf=0x7fe8b7deeb30, fd=16) at ../sysdeps/unix/sysv/linux/read.c:26
#1  __GI___libc_read (fd=16, buf=0x7fe8b7deeb30, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007fe8c587cf55 in ?? () from /usr/lib/x86_64-linux-gnu/libnvidia-tls.so.340.108
#3  0x00007fe8c605ef4f in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fe8c601733e in g_main_context_check () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fe8c6017792 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fe8c601790f in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007fe8c89ab31b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe8c89544db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fe8c877b8de in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fe8c7a6a3a5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007fe8c877ca01 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007fe8c6ea3ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#13 0x00007fe8c841feaf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fe8be432700 (LWP 31299)):
#0  0x00007fe8c84154bf in __GI___poll (fds=0x7fe8b00127a0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fe8c60177ee in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe8c601790f in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe8c89ab31b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe8c89544db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe8c877b8de in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe8c8bfca27 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007fe8c877ca01 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe8c6ea3ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007fe8c841feaf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fe8bf9c9700 (LWP 31298)):
#0  0x00007fe8c84154bf in __GI___poll (fds=0x7fe8bf9c8c68, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fe8c6e63d02 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fe8c6e6598a in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fe8c0394b80 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fe8c877ca01 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe8c6ea3ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fe8c841feaf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fe8c0a0b040 (LWP 31296)):
[KCrash Handler]
#4  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#5  0x00007fe8c8347537 in __GI_abort () at abort.c:79
#6  0x00007fe8c8742b51 in QMessageLogger::fatal(char const*, ...) const () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe8c79ce2b8 in QQmlData::destroyed(QObject*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fe8c89887d1 in QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fe8b62e34ee in ?? () from /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Templates.2/libqtquicktemplates2plugin.so
#10 0x00007fe8c8980cdf in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007fe8c947903f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007fe8c8955b62 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007fe8c89584c1 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007fe8c89abc73 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007fe8c60175fd in g_main_context_dispatch () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007fe8c6017880 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007fe8c601790f in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007fe8c89ab2ff in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007fe8c89544db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007fe8c9670017 in QDialog::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#21 0x00007fe8a93839c0 in KWin::EffectsModel::requestConfigure(QModelIndex const&, QWindow*) () from /usr/lib/x86_64-linux-gnu/libkcmkwincommon.so.5
#22 0x00007fe8a93d7526 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/kcms/kcm_kwin_effects.so
#23 0x00007fe8a93d6ac7 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/kcms/kcm_kwin_effects.so
#24 0x00007fe8a93d6f63 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/kcms/kcm_kwin_effects.so
#25 0x00007fe8c7a145ad in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#26 0x00007fe8c790deea in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#27 0x00007fe8c790fce2 in QV4::QObjectMethod::callInternal(QV4::Value const*, QV4::Value const*, int) const () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#28 0x00007fe8c792a81f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#29 0x00007fe8c792d347 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#30 0x00007fe8c78cb54d in QV4::Function::call(QV4::Value const*, QV4::Value const*, int, QV4::ExecutionContext const*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#31 0x00007fe8c7a2e125 in QQmlJavaScriptExpression::evaluate(QV4::CallData*, bool*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#32 0x00007fe8c79e629b in QQmlBoundSignalExpression::evaluate(void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#33 0x00007fe8c79e6778 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#34 0x00007fe8c7a1405d in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#35 0x00007fe8c898a455 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#36 0x00007fe8beba4f82 in QQuickAction::triggered(QObject*) () from /usr/lib/x86_64-linux-gnu/libQt5QuickTemplates2.so.5
#37 0x00007fe8beba5c62 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5QuickTemplates2.so.5
#38 0x00007fe8beba5f52 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5QuickTemplates2.so.5
#39 0x00007fe8beba6613 in QQuickAction::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5QuickTemplates2.so.5
#40 0x00007fe8c7a145ad in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#41 0x00007fe8c790d808 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#42 0x00007fe8c790fce2 in QV4::QObjectMethod::callInternal(QV4::Value const*, QV4::Value const*, int) const () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#43 0x00007fe8c792a81f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#44 0x00007fe8c792d347 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#45 0x00007fe8c78cb54d in QV4::Function::call(QV4::Value const*, QV4::Value const*, int, QV4::ExecutionContext const*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#46 0x00007fe8c7a2e125 in QQmlJavaScriptExpression::evaluate(QV4::CallData*, bool*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#47 0x00007fe8c79e629b in QQmlBoundSignalExpression::evaluate(void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#48 0x00007fe8c79e6778 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#49 0x00007fe8c7a1405d in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#50 0x00007fe8c898a455 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#51 0x00007fe8beba3d91 in QQuickAbstractButtonPrivate::handleRelease(QPointF const&) () from /usr/lib/x86_64-linux-gnu/libQt5QuickTemplates2.so.5
#52 0x00007fe8bebc17e5 in QQuickControl::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5QuickTemplates2.so.5
#53 0x00007fe8c7dfc748 in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#54 0x00007fe8c947903f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#55 0x00007fe8c8955b62 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#56 0x00007fe8c7e16ae4 in QQuickWindowPrivate::deliverMouseEvent(QQuickPointerMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#57 0x00007fe8c7e17e07 in QQuickWindowPrivate::deliverPointerEvent(QQuickPointerEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#58 0x00007fe8c8db04b5 in QWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#59 0x00007fe8c947903f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#60 0x00007fe8c8955b62 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#61 0x00007fe8c8121be7 in QQuickWidget::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5QuickWidgets.so.5
#62 0x00007fe8c94b952e in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#63 0x00007fe8c947903f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#64 0x00007fe8c947e781 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#65 0x00007fe8c8955b62 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#66 0x00007fe8c947d696 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#67 0x00007fe8c94d195e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#68 0x00007fe8c94d47ae in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#69 0x00007fe8c947903f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#70 0x00007fe8c8955b62 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#71 0x00007fe8c8da444b in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#72 0x00007fe8c8d7abfb in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#73 0x00007fe8c0395b6a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#74 0x00007fe8c60175fd in g_main_context_dispatch () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#75 0x00007fe8c6017880 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#76 0x00007fe8c601790f in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#77 0x00007fe8c89ab2ff in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#78 0x00007fe8c89544db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#79 0x00007fe8c895c782 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#80 0x00005556fea9d64a in ?? ()
#81 0x00007fe8c8348cca in __libc_start_main (main=0x5556fea9d250, argc=1, argv=0x7ffdcfbc8d08, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffdcfbc8cf8) at ../csu/libc-start.c:308
#82 0x00005556fea9d6ca in _start ()
[Inferior 1 (process 31296) detached]

Possible duplicates by query: bug 425388, bug 424911, bug 424729, bug 423951, bug 423638.

Reported using DrKonqi
Comment 1 Edgar 2020-10-08 05:16:46 UTC 
Created attachment 132202 [details]
New crash information added by DrKonqi

systemsettings5 (5.18.3) using Qt 5.13.2

- What I was doing when the application crashed:

- Custom settings of the application: al momento de realizar los cambios de efectos para las ventanas la aplicación se cierra

-- Backtrace (Reduced):
#8  0x00007f6b01c9aa25 in QMessageLogger::fatal(char const*, ...) const () from /lib64/libQt5Core.so.5
#9  0x00007f6b00f2830b in QQmlData::destroyed(QObject*) () from /lib64/libQt5Qml.so.5
#10 0x00007f6b01e867be in QObject::~QObject() () from /lib64/libQt5Core.so.5
#11 0x00007f6ada8467a2 in QQmlPrivate::QQmlElement<QQuickToolButton>::~QQmlElement() () from /usr/lib64/qt5/qml/QtQuick/Templates.2/libqtquicktemplates2plugin.so
#12 0x00007f6b01e80524 in QObject::event(QEvent*) () from /lib64/libQt5Core.so.5
Comment 2 Nate Graham 2021-06-17 19:56:08 UTC 
Cannot reproduce.

Is it still happening to you in a later version? Like Plasma 5.21 or 5.22?
Comment 3 debianick 2021-06-18 11:55:02 UTC 
(In reply to Nate Graham from comment #2)
> Cannot reproduce.
> 
> Is it still happening to you in a later version? Like Plasma 5.21 or 5.22?

I'm on Debian 11 and with plasma 5.20.5 is working now.
I can change translucency on Desktop Effects without problems.