[Bug 1777099] Re: [backport] DRM devices opened by logind stay referenced indefinitely by PID 1

[Steve Langasek]

Hello Alex, or anyone else affected,

Accepted systemd into bionic-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/systemd/237-3ubuntu10.2 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-bionic to verification-done-bionic. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-bionic. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: systemd (Ubuntu Bionic)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-bionic

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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:
  New
Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Committed
Status in systemd source package in Bionic:
  Fix Committed

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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