<![CDATA[Same code different GUI?]]>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:
Debian12KDE.png

Debian 13:
Debian13KDE.png

Regards,
Mucip:)

]]>https://forum.qt.io/topic/165166/same-code-different-guiRSS for NodeTue, 13 Oct 2026 23:00:14 GMTMon, 12 Oct 2026 14:59:41 GMT60<![CDATA[Reply to Same code different GUI? on Tue, 13 Oct 2026 19:26:23 GMT]]>Dear @SGaist ,
I wrote program in QtCreator 6.11.2 in Debian 13.
I copy code to Debain12. Because RockPi use Debian 12. And I use qmak6 to compile in Debian12.
I run compiled program from CLI in Debian12.

Debian 12KDE:
Debian12KDEVersion.png

Debian 13 KDE:
Debian13KDEVersion.png

I use Breeze Dark on both system.

Regards,
Mucip:)

]]>https://forum.qt.io/post/840484https://forum.qt.io/post/840484Tue, 13 Oct 2026 19:26:23 GMT<![CDATA[Reply to Same code different GUI? on Tue, 13 Oct 2026 19:06:03 GMT]]>Can you describe your setup with more precision ?
Which exact version of Qt are you using on each system ?
Which exact version of KDE are you using on each ?
Which style does get loaded and used ?
How are you starting your application ?

]]>https://forum.qt.io/post/840483https://forum.qt.io/post/840483Tue, 13 Oct 2026 19:06:03 GMT<![CDATA[Reply to Same code different GUI? on Tue, 13 Oct 2026 07:01:27 GMT]]>Any suggestion about my problem?

]]>https://forum.qt.io/post/840476https://forum.qt.io/post/840476Tue, 13 Oct 2026 07:01:27 GMT<![CDATA[Reply to Same code different GUI? on Mon, 12 Oct 2026 22:32:20 GMT]]>I started QT_QPA_PLATFORM=eglfs mode I mean without Desktop but nothing changed?!

]]>https://forum.qt.io/post/840471https://forum.qt.io/post/840471Mon, 12 Oct 2026 22:32:20 GMT<![CDATA[Reply to Same code different GUI? on Mon, 12 Oct 2026 21:29:05 GMT]]>Or should I transfer to basic desktop something like xfce?

]]>https://forum.qt.io/post/840470https://forum.qt.io/post/840470Mon, 12 Oct 2026 21:29:05 GMT<![CDATA[Reply to Same code different GUI? on Mon, 12 Oct 2026 21:10:45 GMT]]>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

]]>https://forum.qt.io/post/840469https://forum.qt.io/post/840469Mon, 12 Oct 2026 21:10:45 GMT<![CDATA[Reply to Same code different GUI? on Mon, 12 Oct 2026 21:01:37 GMT]]>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.

]]>https://forum.qt.io/post/840468https://forum.qt.io/post/840468Mon, 12 Oct 2026 21:01:37 GMT<![CDATA[Reply to Same code different GUI? on Mon, 12 Oct 2026 20:57:20 GMT]]>I forgot. I did not say that I run Debain12 on single board computer. RockPi ?!
Is the reason be this?

]]>https://forum.qt.io/post/840467https://forum.qt.io/post/840467Mon, 12 Oct 2026 20:57:20 GMT<![CDATA[Reply to Same code different GUI? on Mon, 12 Oct 2026 20:46:34 GMT]]>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.

]]>https://forum.qt.io/post/840463https://forum.qt.io/post/840463Mon, 12 Oct 2026 20:46:34 GMT<![CDATA[Reply to Same code different GUI? on Mon, 12 Oct 2026 16:06:59 GMT]]>Hi,
What you mean? Which style?

Do you mean KDE Plazma Style?

]]>https://forum.qt.io/post/840460https://forum.qt.io/post/840460Mon, 12 Oct 2026 16:06:59 GMT<![CDATA[Reply to Same code different GUI? on Mon, 12 Oct 2026 15:46:59 GMT]]>I would say the style is different.

]]>https://forum.qt.io/post/840458https://forum.qt.io/post/840458Mon, 12 Oct 2026 15:46:59 GMT