I have another big clue
This happened to me also, I'm on kubuntu 16.04.2 with nvidia drivers 384.47 and everything has been working fine while I was using xserver-xorg 1.18 (except for the know tearing).
So I updated to xserver-xorg-core-hwe 1.19.3 from the xenial proposed ppa and the cursor got corrupted.
So, it has to do with updating to xorg 1.19 and nvidia propietary driver
On the bright side, xorg 1.19 indeed fixes the screen tearing and vsync with the line "options nvidia_384_drm modeset=1" in /etc/modprobe.d/zz-nvidia-modeset.conf
I have another big clue xorg-core- hwe 1.19.3 from the xenial proposed ppa and the cursor got corrupted. d/zz-nvidia- modeset. conf
This happened to me also, I'm on kubuntu 16.04.2 with nvidia drivers 384.47 and everything has been working fine while I was using xserver-xorg 1.18 (except for the know tearing).
So I updated to xserver-
So, it has to do with updating to xorg 1.19 and nvidia propietary driver
On the bright side, xorg 1.19 indeed fixes the screen tearing and vsync with the line "options nvidia_384_drm modeset=1" in /etc/modprobe.