That's my problem, I can not turn on vsync (or vertical synchronization) in gnome shell, so that videos are "choppy" vertically. I must say that I have a HD integrated graphics intel sandy bridge, in ubuntu with nvidia card is easily activated from the nvidia control panel. as I can do the same in intel? It also clarifies that I can enable compiz vsync from ccsm, but I find nothing in shell
You should know about X.Org Server.
You can configure xorg to enable or disable vsync. You can define modeline without vsync: https://wiki.ubuntu.com/X/Config/Resolution#Adding_undetected_resolutions
Maybe there are also Options for vsync (so you can change vsync for all modes) but I'm not sure about this.
Also make sure that you have
Intel driver has a good option for tear free rendering:
under the Section device which use intel driver add the following option:
If you do not have the xorg.conf file you can easy generate them for you using nvidia-settings or using Xorg
Look at this
I hope it helped you.