Observed UI flickering on ARM target

SGaist

Are you using a Texas Instruments evaluation board ?

Praveen.Illa

@SGaist
We are running Qt on customized TI AM437x boards. Please find below board details and SW components

Kernel Version: 4.19.94
SOC: TI AM4378
Resolution: 1024*600
Screen size: 7" & 10"
GPU: SGX530 Graphics Engine

SGaist

Could it be that you have the tty cursor that is blinking through your UI ?

Praveen.Illa

@SGaist
I have disabled the tty cursor. Still, I could see flickering on UI.
Below is the code, I have commented
.

SGaist

Would it be possible to see the video of the flickering ?

Praveen.Illa

@SGaist
I am not able to attach the video in this forum. I am getting below error

So, I am attaching the image

Please refer to the attached image where the image in top right corner is the image of previous screen. It is displaying in fraction of seconds and goes off., and this flickering happens continuously

SGaist

Is it a widget or Qt quick application ?

JoeCFD

@Praveen-Illa add 10ms or maybe 5ms delay to this widget display to see if it helps. Also you need to call update explicitly if this widget is customized. Qt widgets update is not very clean on touch screen.

Praveen.Illa

@SGaist
It is a Qt Quick application

SGaist

Do you have the same issue with a minimal default application ?

Praveen.Illa

@SGaist Thank you for your response
I have resolved this issue by changing the graphics driver.
I am attaching the link below for others who are facing this kind of problem.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1060753/am4378-flickering-issue-on-qt-with-eglfs-instance