qt gui on rpi

[lina]

I write a gui with qt. I run it on rpi2 touchscreen lcd(3.2 inch). when it executes , it's not stable on lcd and it disappear with each click. sometimes gui is disappeared totaly and sometimes part of touch click is disappeared. how can I fix this problem?

[micland]

@lina
I had similiar problems which could be solved in my case by extending the GPU memory (via raspi-config, set it to 265 MB instead of the default 64 MB).

[lina]

@micland
Thank you for your response. Unfortunately, changing GPU memory to 256MB didn't solve the problem :(

[sneubert]

Hi lina,

which platform plugin do you use? xcb, eglfs, linuxfb?
Are you running an xserver?

[lina]

This post is deleted!

[lina]

@sneubert

hi Sneubert
I'm using linuxfb plugin and runing xserver

[sneubert]

Ok, so just shut down your xserver or use xcb.
If using linuxfb and running a xserver, both will write to the framebuffer, which cause the flickering.
And with edev both will respond to touch events.

[lina]

@sneubert
thank you for your response. I try it.