https://bugs.kde.org/show_bug.cgi?id=430376
Bug ID: 430376
Summary: QWidget doesn't correctly open in full screen on
specific monitor if told to do so on Wayland
Product: kwin
Version: 5.19.5
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: m.wegh...@posteo.de
Target Milestone: ---
Created attachment 134071
--> https://bugs.kde.org/attachment.cgi?id=134071&action=edit
Sample program to reproduce the issue
SUMMARY
In a dual screen setup, trying to open a QWidget in full screen on a specific
monitor does not work on Wayland, which breaks e.g. LibreOffice Impress
presentation mode.
STEPS TO REPRODUCE
0. use KDE Plasma Wayland with a dual screen setup
1. compile and run the attached sample program "main.cpp" (source code also
given below)
2. run the program
OBSERVED RESULT
Two white/empty widgets open in full screen on the first/same screen.
EXPECTED RESULT
One full screen widget on each of the two screens.
SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux
KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74.0
Qt Version: 5.15.1
Kernel Version: 5.9.0-4-amd64
OS Type: 64-bit
Processors: 12 × Intel® Core™ i7-9850H CPU @ 2.60GHz
Memory: 62.4 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 630
ADDITIONAL INFORMATION
* It works as expected when run with env variable 'QT_QPA_PLATFORM=xcb' set,
i.e. using XWayland.
* My setup for testing includes a laptop with an internal screen + an attached
external screen, both with a resolution of 1920x1080.
* This was originally reported as a LibreOffice Impress bug at
https://bugs.documentfoundation.org/show_bug.cgi?id=128214
* The LibreOffice scenario works fine when using LibreOffice with the gtk3
integration ("VCL plugin") on GNOME Wayland, but not when using the gtk3
integration on Plasma Wayland either (tested with LibreOffice from Debian
testing, package version 7.0.3-4+b1).
* Sample program:
#include <QApplication>
#include <QScreen>
#include <QWidget>
#include <QWindow>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
for (QScreen* screen : qApp->screens()) {
QWidget * widget = new QWidget;
widget->show();
QRect screenGeometry = screen->geometry();
widget->windowHandle()->setScreen(screen);
widget->move(screenGeometry.topLeft());
widget->showFullScreen();
}
return a.exec();
}
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