Qt5 QML App not visible when change the resolution ?

[Alex_wang]

@SGaist

Does it have an event in Qt5.9.3 that notices the connector resolution changing ?

[Devopia53]

@Alex_wang

Yes, of course. Read the following document.

QScreen
Screen

like this:

#include <QScreen>
[...]
QScreen     *screen = QApplication::primaryScreen();
QObject::connect(screen, &QScreen::geometryChanged, [](const QRect &geometry){ qDebug() << geometry; });
[...]

[Alex_wang]

@Devopia53 said in Qt5 QML App not visible when change the resolution ?:

QObject::connect(screen, &QScreen::geometryChanged, [](const QRect &geometry){ qDebug() << geometry; });

Hi, it is not helpful for me.

when I change the resolution, the screen (QApplication::primaryScreen()) is not changed....

[jsulm]

@Alex_wang Do you mean the QScreen::geometryChanged signal is not emitted?

[SGaist]

By the way, how are you changing the resolution ?

[Alex_wang]

@SGaist
change the resolution by an app "drm_modeset":

sudo ./drm_modeset -s 1920x1080@60

[Alex_wang]

after changed the resolution, the surface or screen or window for qt5 app is still depending on last resolution.
the reason is on four floor

[SGaist]

See here and the QT_QPA_EGLFS_ALWAYS_SET_MODE environment variable.

[Alex_wang]

@SGaist
I have got it . It means I still have to relaunch the application.

[SGaist]

Do you have any other application running on your system ?

[Alex_wang]

@SGaist
The decoded video is also rendered by DRM, which is running on my system.

[SGaist]

You have to give more details about your system and what it does.

[Michael Chen]

@Alex_wang
Have you found a solution? I'm also having the same problem.