问题表现为横向拖动窗口时窗口左右边框出现撕裂的现象，查询后得知是NVIDIA驱动安装后由于与SLI不兼容而并未默认开启PRIME Synchronization，开启方法如下：
sudo nano /etc/modprobe.d/nvidia-graphics-drivers.conf
Change the line that says “nvidia-drm.modeset=0” to “nvidia-drm.modeset=1”
PressCtrl+xto exit and press “y” to indicate that you like to save your change.
sudo update-initramfs -u
Reboot your computer.
cat /sys/module/nvidia_drm/parameters/modesetshould be “1” or “Y”.
我用这个方法成功开启了PRIME Synchronization，当然你可以尝试NVIDIA官方论坛提出的解决方法：
The NVIDIA driver’s PRIME Synchronization support relies on DRM-KMS, which is disabled by default due to its current incompatibility with SLI. To enable it, run ‘sudo rmmod nvidia-drm; sudo modprobe nvidia-drm modeset=1’. In other words, load the nvidia-drm module with the parameter modeset=1.
[1]/default/topic/957814/prime-and-prime-synchronization/
[2]/questions/13450/vsync-issue-with-switchable-graphics-nvidia-630m-intel-hd-3000-on-elementar
