I've been testing 1.19.x in 17.04 pre-release for a few weeks, hoping to
take advantage of the Nvidia PRIME synchronisation fix for laptops with
Optimus hybrid graphics. As of 1.19.3, PRIME sync works (with a modprobe
fix related to the nvidia driver). This is a huge improvement for nvidia
Optimus users (i.e. most high-end laptops I suspect), since it means no
more screen tearing on the laptop's LCD panel when hybrid graphics mode
is activated. My testing has been on a Thinkpad P50.  Really hope 1.19
gets into 17.04, and then into 16.04.3

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Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1671799

Title:
  FFe: xserver 1.19.3

Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  xserver 1.19 has been out for quite some time now. Debian Stretch will
  release with it, and xmir has been recently ported so we can push 1.19
  to zesty now. It's currently being staged on a ppa:

  https://launchpad.net/~canonical-x/+archive/ubuntu/x-staging

  The main features of this release are:
  - PRIME synchronization support, should reduce tearing on hybrid setups
  - GLAMOR (2D accel over OpenGL) improvements
  - threaded input

  This bugreport is also for gathering testing feedback.

  Tested to be working fine on:
  - Intel Kabylake
  - Intel Broadwell
  - Intel+NVIDIA hybrid (Skylake + 930MX, with OSS and blob drivers)
  - Intel+NVIDIA hybrid (Haswell + NVIDIA GK107M [GeForce GT 755M])
  - Intel+NVIDIA hybrid (Ivybridge + NVIDIA GK107M [GeForce GT 660M])
  - Radeon SI (radeon & amdgpu drivers)
  - qemu (QXL)

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