ComboBox Drop-down list

? Offline

hi,

I have a problem with comboBox, it doesn't show drop-down list.
I tried everything to fix this problem, but without success.
Currently i do compile my code with Qt 5.15.2 and Qt Creator 4.8.2.
I exclude problem in the source code in this case, since the same part of code with the comboBox works fine with Qt5.6.2 and Qt Creator 4.8.2 on other embedded device.
So, what could be the root cause here, is it Qt version related or Device related or what?

many thanks for help!

SGaist

Hi and welcome to devnet,

Can you share a minimal example that shows that behaviour ?
Which OS are you on ?

? Offline

@SGaist
hi,
the problem occurs in principle with every combobox that I insert.
For example, I add a combobox with 3 items, compile and run the program on the embedded device, when I press on the combobox, a drop-down list with the 3 items should appear, currently it doesn't.

I've attached two pictures, the first one shows how it works on the old embedded linux device ==> combo box with drop-down list

The second picture, on the new embedded device (also linux)
shows the misbehaviour of the combobox ==> drop-down list is not displayed

I am currently developping on Linux debian (Linux debian 4.19.0-21-amd64 #1 SMP Debian 4.19.249-2 (2022-06-30) x86_64 GNU/Linux)

SGaist

What are you running on your target ?

? Offline

@SGaist

hi and sorry for the late answer,

An application runs on the display to control a vehicle and display operating parameters

The OS on Display is linux variant from IFM:
Linux pdm3 5.10.127-stable-standard #1 SMP PREEMPT Wed Jun 29 06:59:54 UTC 2022

SGaist

Does it use any window manager ?

? Offline

Hi,

no, it doesn't.
it just uses a layer manager to share the screen with a Codesys app.

SGaist

Can you give more details about that ?