Hi,

I have this issue in Plasma (unlock mini-programs) or dolphin (delete file), when I do it the first time after the start of the program or plasma.
The pop up window / dialog windows takes 2-3 seconds to open properly, in this time, only the borders of the windows are shown.
This happens only when the pop up window is assigned to a sound notification.
When I do it a second time (eg delete in dolphin), then I have no delay

Maybe it's not a kwin problem, sorry I don't know

Pulsaudio is installed
kwin and plasmashell version 5.5.2

Disabling compositing has no effect.

Arch Linux System x86
log/journal-output:
Dez 23 23:02:40 dixi-arch dolphin[1561]: org.kde.knotifications: Calling notify on "Sound"
Dez 23 23:02:43 dixi-arch dolphin[1561]: org.kde.knotifications: Changing audio state from Phonon::LoadingState to Phonon::StoppedState
Dez 23 23:02:43 dixi-arch dolphin[1561]: org.kde.knotifications: Calling notify on "Taskbar"
Dez 23 23:02:43 dixi-arch dolphin[1561]: org.kde.knotifications: 0 12582947
Dez 23 23:02:43 dixi-arch dolphin[1561]: org.kde.kwindowsystem: Loaded plugin "/usr/lib/qt/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so" for platform "xcb"
Dez 23 23:02:43 dixi-arch dolphin[1561]: org.kde.knotifications: Changing audio state from Phonon::LoadingState to Phonon::StoppedState
Dez 23 23:02:44 dixi-arch dolphin[1561]: org.kde.knotifications: Changing audio state from Phonon::StoppedState to Phonon::PausedState
Dez 23 23:02:44 dixi-arch dolphin[1561]: org.kde.knotifications: Changing audio state from Phonon::PausedState to Phonon::PlayingState
Dez 23 23:02:46 dixi-arch dolphin[1561]: org.kde.knotifications: Changing audio state from Phonon::PlayingState to Phonon::StoppedState

any idea?
thx

It takes so long because QtQuick (or "how plasmashell uses it", I don't care) is slow, sorry. See viewtopic.php?f=289&t=130131
It's probably extra slow (or perfoms some sync sound setup on showing the window) in special cases.

You see the empty window (instead of nothing) because of a bug in Qt5 which presently kills the XSYNC protocol. See https://bugs.kde.org/show_bug.cgi?id=356562 on details. This is supposed to be fixed (hopefully in Qt5.6)

Hi Tom,

thx a lot for your explanation.

workaround for me: switch to phonon-backend VLC: The delays are gone - I'm ok with that

regards

PS: I think, I had this issue also with KDE4 when KDE released KDE Applications 15.08, just fyi. But this Plasma5 installation is a fresh one; maybe some xfce-remains