Same code different GUI?

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?!

Mucip

Any suggestion about my problem?

SGaist

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 ?

Mucip

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:

Debian 13 KDE:

I use Breeze Dark on both system.

Regards,
Mucip:)

SGaist

So I would take that you are using 6.4.2 on Debian 12 ? That means a gap of four minor versions between the two.
That does not fully explain the difference but there might have been fixes between the two versions.
Are you using QML for you UI ?
Also, which style gets loaded ?

Mucip

I use UI not QML.
I did not understan your last question. Style? In Qt or in Plasma?

Regards,
Mucip:)