i.MX 6 DL v-sync

I’ve been trying to use vertical sync in my OpenGL ES application.
But I didn’t.

My environment is below:
Image : https://boundarydevices.com/debian-8-3-jessie-for-i-mx6-boards-february-2016-kernel-3-14-28/
Graphics driver : vivante
OpenGL ES version : 3.0

Also I tried to use FB_MULTI_BUFFER and eglSwapInterval, but I did not work it.
And I’m ready to tell you some informations what you need to solve this issue.
Any ideas?

Please have a look at NXP’s i.MX 6 Graphics User’s Guide. Regarding support for random images from random vendors please enquire them about it.