Same code different GUI?

Mucip

Hi,
I have written a program with Qt 6 on Debian 13.
I moved the same code and recompile on Debian 12.
Both use KDE but I see different GUI on the screen. Why?

By the way I use;

w.setWindowState(Qt::WindowFullScreen);

in main.cpp

Debian 12:

Debian 13:

Regards,
Mucip:)

Christian Ehrlicher

I would say the style is different.

Mucip

Hi,
What you mean? Which style?

Do you mean KDE Plazma Style?

SGaist

Hi,

Likely yes.
Start your application with the QT_DEBUG_PLUGINS environment variable set to 1.
You will be able to see which plugins get loaded and compare between both systems.

Mucip

I forgot. I did not say that I run Debain12 on single board computer. RockPi ?!
Is the reason be this?

SGaist

Board or full computer should not make a difference in that case. You likely have two different versions of KDE and Plasma running which may be using a different style hence the suggestion to check which one is being loaded.

Mucip

OK. I see many changes on both loading things. And very difficult to see reason for me?!

But I can not add both txt files here?!

But I see in first lines:
Debian12 uses;
QVncIntegrationPlugin
QXcbIntegrationPlugin
QVkKhrDisplayIntegrationPlugin

Debian13 uses;
QXcbIntegrationPlugin
QLinuxFbIntegrationPlugin
QOffscreenIntegrationPlugin

Mucip

Or should I transfer to basic desktop something like xfce?

Mucip

I started QT_QPA_PLATFORM=eglfs mode I mean without Desktop but nothing changed?!