Flickering Animations on QNX

zhannum

Hi, we are currently experiencing issues running Qt UI applications on a ZCU102 evaluation board running QNX 7. The issue manifests as a black flickering that occurs whenever there is any animation on the screen. The same applications run fine without flickering on Desktop Linux. We've tested on different monitors/cables.

When running built in graphics demos (on the ZCU102 board), this flickering does not occur, only when running Qt UI applications. We are attempting to run Qt Quick 2 applications, but the issue also manifests when running Qt demos such as the OpenGLWindow example application.

The animation test application we are running is using Qt Quick 2 and is a simple Rectangle animating back and forth.

The following video is running the animation test on Desktop Linux
https://streamable.com/53554

And this video is the display out from the QNX target:
https://streamable.com/84sva

The graphics.conf we are using is here:

begin khronos

  begin egl display 1
    egl-dlls = libmali.so
    glesv1-dlls = libmali.so
    glesv2-dlls = libmali.so
    gpu-dlls = libmali-kbase.so
  end egl display

  begin wfd device 1
    wfd-dlls = libwfdcfg-zcu102.so libWFDzynq.so
  end wfd device

end khronos

begin winmgr

  begin globals
    input-logsize = 8192
    input = keyboard mouse
    requests-logsize = 65536
    alloc-config = zynq-alloc
  end globals

  begin display internal
    video-mode = 1280 x 720 @ 60
  end display

  begin class framebuffer
    display = internal
    pipeline = 2
    format = rgba8888
    usage = sw
  end class

end winmgr

It seems that the streams coming from the actual process are good and do not have the flicker (under /dev/screen/[process-id]/str-0, but the frame buffer under /dev/screen/0/str-1 does contain the flickering.

I also have all of the debugging output from /dev/screen/ on the target device, but I am unable to upload all of the files to the forum due to privileges.

SGaist

Hi,

There might not be anyone here being able to answer QNX related question. You should check the #qt-qnx IRC channel on freenode to see if you can have somebody taking a look at you thread here.

zhannum

@SGaist Yeah, I figured that would probably be the case. Thanks!