Blank screen in RaspberryPi

MajidKamali

Hi.
I cross compiled Qt 5.12.3 for raspberry pi 3 B+ successfully with this link.
But when I compile and deploy application to raspberry, screen is blank and lots of following error is shown in console:

QOpenGLShaderProgram::uniformLocation(qt_Matrix): shader program is not linked
QOpenGLShaderProgram: could not create shader program
QOpenGLShader: could not create shader
QOpenGLShader: could not create shader
shader compilation failed: 
""

Screen is a common HDMI monitor.
What should I do? :(
Thanks

MajidKamali

I recompiled and reinstalled everything from scratch and it worked, UNTILL I installed something in raspberrypi (gpac, for MP4Box tool), and blank screen come again :(
That's strange :|
there is a Buffer creation failed error, before above errors.

jsulm

@MajidKamali What do you use on the device? X11? Framebuffer? ...?

MajidKamali

eglfs. device is a raspberry pi 3 B+