[Bug 1777099] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for systemd has completed
successfully and the package has now been released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
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the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
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https://bugs.launchpad.net/bugs/1777099

Title:
  [backport] DRM devices opened by logind stay referenced indefinitely
  by PID 1

Status in OEM Priority Project:
  Triaged
Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Committed
Status in systemd source package in Bionic:
  Fix Released

Bug description:
  [Impact]

   * It should be possible to change DRM driver without rebooting.
   * It should be possible to correctly suspend & resume, whilst preserving driver state.
   * This bug is for userspace/logind fixes, required to get above working.
   * Related kernel change is https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1778658
   * https://github.com/torvalds/linux/commit/5775b843a619b3c93f946e2b55a208d9f0f48b59

  [Test Case]

   * Test and verify that on machines with Nvidia discrete graphics, one
  can change performance/power-saving modes without rebooting.

  [Regression Potential]

   * There are changes to the fd handling that are passed to logind. At
  worst, fd to the NVIDIA driver will still be held, and thus one would
  continue to not be able to switch graphics modes without rebooting.

  [Other Info]
   
   * original bug report:

  refer to https://github.com/systemd/systemd/issues/6908

  we need that solution to make NVIDIA dGPU switching works.

  impacted issue:
  https://bugs.launchpad.net/somerville/+bug/1774326

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