GUI application display problem on S5p4418 chip Lubuntu OS

[manil]

Hi everyone,
I am new about Qt and embedded arm. I am using a single board computer has samsung s5p4418 arm chip and Qt 5.4, my GCC 4.9.3 ans OS is lubuntu 12.04. After completed cross compile and Qt setups, I try to run all Qt GUI examples, but I faced a silly problem which when I move the mouse pointer above GUI example, mouse pointer deletes view of example step by step. The other examples, is not GUI, works fine, there is no problem.
Is there any one to help me about that? Any idea?
Thank you

[SGaist]

Hi and welcome to devnet,

Did you check that don't have anything else running on the device where you show the application GUI ?

[manil]

Yes I checked, nothing is running. GUI is running on Lubuntu desktop. And also rollbar, exit button, fullscreen button on the top of the GUI doesn't appear.

[SGaist]

So what plugin are you using to run your application on your device ?

[manil]

I am not sure I understand what you mean sorry but there is Qt's own plugins files in both device and project.

[SGaist]

I mean: are you using the xcb backend ? eglfs ? linuxfb ? etc.

[manil]

ahh. I am using linuxfb.

[SGaist]

Do you have a console active on the frame buffer device ?

[manil]

No,I don't have.

[SGaist]

No X server running on the device ?