Comment 0 for bug 1674304

xserver-1.19.x is being proposed for 17.04, currently available in test ppa
https://launchpad.net/~canonical-x/+archive/ubuntu/x-staging
FFe - https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1671799

On 2 separate Optimus laptops there is no sign of it actually working, tearing while using nvidia drivers (375.x) is rampart.
Testing with both current 4.10.0-13 & previous 4.9.0-11 kernels.

Shows this in kern.log so support is enabled

Mar 19 08:18:47 doug-Lenovo-IdeaPad-Y510P kernel: [ 1.746443] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
Mar 19 08:18:47 doug-Lenovo-IdeaPad-Y510P kernel: [ 1.746444] [drm] Driver supports precise vblank timestamp

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: nvidia-prime 0.8.4
ProcVersionSignature: Ubuntu 4.10.0-13.15-generic 4.10.1
Uname: Linux 4.10.0-13-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.4-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity:Unity7
Date: Mon Mar 20 07:53:12 2017
InstallationDate: Installed on 2017-03-15 (4 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Alpha amd64 (20170311)
SourcePackage: nvidia-prime
UpgradeStatus: No upgrade log present (probably fresh install)