Comment 7 for bug 1260128

Just to note about the above -
If nvidia-prime is used to switch to the intel gpu the xorg.conf is removed or moved to xorg.conf.xxxxxx
When switching back a new xorg.conf is created which will not contain the Option "TearFree" "True" line.

Whether whatever creates that xorg.conf should add the line by default is unknown here.
(though if anyone can point to what/how creates the xorg.conf would like to know