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IMX6Q OpenGL display obligue screen tearing

Question asked by Wang Hogan on Feb 19, 2017
Latest reply on Feb 28, 2017 by Bio_TICFSL

I am using imx6 to display some graphs with OpenGL(config as FB). I found some strange phenomenons(oblique screen tearing) apear like this. 

tearing picture                                            right picture



It does't looks like screen tearing appearing when write the device "/dev/fb0". Did anyone know how to fix this problem?

I used "eglSwapBuffers(egldisplay, eglsurface);" to flush the buffer. And the code is modified by the gpu_sdk_v1.00/Samples/GLES1.1/01_SimpleTriangle.c. I just modified the left and right vertex position, the top vertex is changing with frame number.