v-sync is it working or not?

[m][sko]

v-sync is it working or not?

I just start up debian xenial x.org with meson drm driver, but it looks like v-sync don't work.

Should I change something in x config ?

amlogic drivers has always problem problem with v-sync only video decoder pipeline( amlogic magic idea how to do video decoding) is sync-ed properly

 

I opened terminal and I moved it down and can see window from prev. frame so v-sync don't work

[m][sko]

I made this example so anybody can try 

https://github.com/xlazom00/docs/blob/master/drm-howto/modeset-vsync.c

You will need to disable your window manager 

https://unix.stackexchange.com/questions/264393/how-to-disable-x-server-autostart-in-debian-jessie