[Bug 1093313] Re: plymouth-stop.conf needs "instance" because it may need to be run multiple times

[Steve Langasek]

> However in the lightdm init configuration file, the
> lightdm job stops without doing anything because
> lightdm is not the default-display-manager.

That's a bug in the lightdm job.  Lightdm must *always* ensure that
plymouth is stopped, even when lightdm will not be started.  This is an
oversight - as you can see from the job, there are two other cases where
the job explicitly handles plymouth stop, it's only the "not the default
DM" case that needs to be fixed.

** Package changed: plymouth (Ubuntu) => lightdm (Ubuntu)

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Title:
  plymouth-stop.conf needs "instance" because it may need to be run
  multiple times

Status in “lightdm” package in Ubuntu:
  New

Bug description:
  PRETTY_NAME="Ubuntu quantal (12.10)"
  VERSION="12.10, Quantal Quetzal"

  Package: plymouth
  Origin: Ubuntu
  Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
  Architecture: i386
  Version: 0.8.4-0ubuntu3

  
  Currently, the init job plymouth-stop will only run once during the bootup sequence, but in cases where the user has installed more than one display manager, it will need to be run more than once.

  Consider this example.

  xdm is installed and made the default-display-manager.

  plymouth-stop is called on  stopped rc RUNLEVEL=[2345]  (JOB is rc),
  xdm runs and Xorg starts.

  lightdm is then installed but xdm is left as the default-display-
  manager.

  plymouth-stop is now called on starting lightdm (JOB is lightdm) but
  the case statement results in exit 0 with no action as lightdm is
  expected to take care of stopping plymouth.

  However in the lightdm init configuration file, the lightdm job stops
  without doing anything because lightdm is not the default-display-
  manager.

  The boot sequence continues and xdm finally gets to run.  plymouth is
  still running and is never stopped because plymouth-stop has already
  run and is only allowed to run once.

  In some cases this prevents the Xorg server from starting with
  "setversion 1.4 failed" and " [drm] failed to set drm interface
  version,  Kernel modesetting setup failed', presumably because
  plymouth is  hogging the virtual console on which X is to be started.

  Thus the problem is rectified by allowing plymouth-stop to be run
  multiple times for each display manager installed by adding the line

  instance    ${JOB}

  to the plymouth-stop.conf file.

  This may cure some bug reports that other users have reported of
  plymouth not stopping when running other display managers eg slim

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