It seems the problem is caused by the backing store function of xorg. It is disabled by default in 1.14.5 and enabled by default in 1.15.0. If I disable it with -bs on xorg startup, I have no tearing with 1.15.0.
It seems the problem is caused by the backing store function of xorg. It is disabled by default in 1.14.5 and enabled by default in 1.15.0. If I disable it with -bs on xorg startup, I have no tearing with 1.15.0.