[Bug 1637180] Re: "The computer needs to restart" dialog constantly eats CPU

[Launchpad Bug Tracker]

** Branch linked: lp:update-manager

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https://bugs.launchpad.net/bugs/1637180

Title:
  "The computer needs to restart" dialog constantly eats CPU

Status in One Hundred Papercuts:
  Confirmed
Status in update-manager package in Ubuntu:
  In Progress
Status in update-manager source package in Artful:
  Confirmed
Status in update-manager source package in Bionic:
  In Progress

Bug description:
  [Impact]
  Ubuntu users wishing to run updates, potentially with specific combinations of customized theming on their desktop.

  [Test case]
  1) Run update-manager
  2) Apply updates (this should include an update that requires reboot, such as a kernel update, system library (libc?)...
  3) Let the "This computer needs to restart" dialog appear.

  [Regression potential]
  Failure of the "restart" dialog to appear or screen/window corruption when this dialog appears should be investigated as possible regressions. It is also possible that the behavior of the window changes in that its size might not remain static.

  
  ---

  After installing certain updates (kernel, system libraries, etc.), the
  "The computer needs to restart" dialog appears periodically, prompting
  the user to restart the system.

  That dialog eats a constant 8-10% of CPU time. That's the issue. (Yes,
  update-manager is niced to 10, but why consuming *any* CPU at all for
  showing a static dialog?)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: update-manager 1:16.04.4
  ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19
  Uname: Linux 4.4.0-38-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Oct 27 14:07:11 2016
  ExecutablePath: /usr/bin/update-manager
  GsettingsChanges:
   b'com.ubuntu.update-manager' b'show-details' b'true'
   b'com.ubuntu.update-manager' b'window-height' b'766'
   b'com.ubuntu.update-manager' b'first-run' b'false'
   b'com.ubuntu.update-manager' b'window-width' b'939'
   b'com.ubuntu.update-manager' b'launch-time' b'1477544773'
  InstallationDate: Installed on 2016-04-22 (188 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  InterpreterPath: /usr/bin/python3.5
  PackageArchitecture: all
  SourcePackage: update-manager
  UpgradeStatus: No upgrade log present (probably fresh install)

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