[Bug 1720131] Re: logind holds open file descriptor to DRI nodes, preventing nvidia suspend

[Ard van Breemen]

The bug prevents use of systems "blessed" with nvidia optimus.
It has been fixed however.
https://github.com/systemd/systemd/issues/6908

I hope the fix can be incorporated into bionic, because it would be sad to have an LTS release that can not turn of the nvidia GPU without rebooting the system.
Of course the fix is to upgrade to systemd 238, and the new bugs in 238 are fixed in 238+10.

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https://bugs.launchpad.net/bugs/1720131

Title:
  logind holds open file descriptor to DRI nodes, preventing nvidia
  suspend

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  The nvidia binary kernel driver now creates /dev/dri/card? nodes.

  When switching between the nvidia and intel drivers on a hybrid
  system, all holders of the DRI node need to relinquished so that the
  nvidia driver can be unloaded so that bbswitch can turn the card off.

  In order for switching hybrid graphics to not require a reboot, logind
  needs to close its file descriptor to the nvidia DRI node.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: systemd 234-2ubuntu10
  ProcVersionSignature: Ubuntu 4.13.0-11.12-generic 4.13.1
  Uname: Linux 4.13.0-11-generic x86_64
  NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia zfs zunicode zavl zcommon znvpair
  ApportVersion: 2.20.7-0ubuntu1
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Thu Sep 28 08:36:13 2017
  InstallationDate: Installed on 2017-09-20 (8 days ago)
  InstallationMedia: Ubuntu-GNOME 17.10 "Artful Aardvark" - Alpha amd64 (20170919)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 8087:0a2b Intel Corp. 
   Bus 001 Device 002: ID 1c7a:0603 LighTuning Technology Inc. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: System76 Oryx Pro
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-11-generic.efi.signed root=ZFS=rpool/system ro
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/20/2017
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.05.02dRSA1 02/20/2017
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: Oryx Pro
  dmi.board.vendor: System76
  dmi.board.version: oryp3-ess
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: System76
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.05.02dRSA102/20/2017:bd02/20/2017:svnSystem76:pnOryxPro:pvroryp3-ess:rvnSystem76:rnOryxPro:rvroryp3-ess:cvnSystem76:ct10:cvrN/A:
  dmi.product.family: Not Applicable
  dmi.product.name: Oryx Pro
  dmi.product.version: oryp3-ess
  dmi.sys.vendor: System76

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