An upload of ubuntu-drivers-common to bionic-proposed has been rejected
from the upload queue for the following reason: "contains change to
systemd service with no bug reference;
https://bugs.launchpad.net/ubuntu/+source/nvidia-
prime/+bug/1778011/comments/10".

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https://bugs.launchpad.net/bugs/1778011

Title:
  SRU: PRIME Power Saving mode draws too much power

Status in gdm3 package in Ubuntu:
  Fix Released
Status in nvidia-graphics-drivers-390 package in Ubuntu:
  Fix Released
Status in nvidia-prime package in Ubuntu:
  Fix Released
Status in nvidia-settings package in Ubuntu:
  Fix Released
Status in ubuntu-drivers-common package in Ubuntu:
  Fix Released
Status in gdm3 source package in Bionic:
  In Progress
Status in nvidia-graphics-drivers-390 source package in Bionic:
  In Progress
Status in nvidia-prime source package in Bionic:
  In Progress
Status in nvidia-settings source package in Bionic:
  In Progress
Status in ubuntu-drivers-common source package in Bionic:
  In Progress

Bug description:
  SRU Request:

  [Impact]
  Relying on the nouveau driver and on the vga switcheroo (to get around a 
change in systemd LP: #1777099) caused increased power consumption, and slowed 
down the switching process.

  Furthermore, if the main X/Xwayland session was started by Gdm when
  the nvidia driver was loaded, the session will keep the nvidia module
  loaded, and prevent the system from switching off the dGPU. Also, the
  nouveau driver will be loaded, if nvidia is not, and this can cause
  problems to unsupported NVIDIA GPUs.

  The solution involves the following changes:

  1) Solving the problem in systemd (LP: #1777099)

  2) Adding code in gpu-manager and in nvidia-prime to unload the nvidia
  modules, and to allow the PCI device to sleep.

  3) Making a slight change to the current patch in Gdm, used to call
  the PRIME scripts before and after a Gdm session (so that gpu-manager
  gets actually called on log out)

  4) Adding code in gpu-manager to kill the main X/Xwayland session on
  log out, if the session is preventing us from unloading the nvidia
  driver. A new X/Xwayland session will be created after unload the
  module.

  5) Removing the systemd service that loads nouveau from the nvidia
  packages.

  
  [Test Case]
  1) Enable the -proposed repository, and install the new 
"ubuntu-drivers-common", nvidia drivers, nvidia-prime, and gdm3

  2) Make sure the nvidia packages are installed, and enable performance mode 
(if it is already enabled, call "sudo prime-select intel" first):
  sudo prime-select nvidia

  3) Restart your computer and attach your /var/log/gpu-manager.log. see
  if the system boots correctly. If unsure, please attach your /var/log
  /gpu-manager.log and /var/log/Xorg.0.log

  4) Select power saving mode:
  sudo prime-select intel

  5) Log out and log back in

  6) Check if the nvidia driver is still loaded:
  lsmod | grep nvidia

  
  [Regression Potential]
  Low, as hybrid graphics support does not work correctly, and the changes only 
affect this use case.

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