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
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.
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