[Bug 1975421] Re: Make Plymouth hide ALL messages on boot, reboot, halt. Plymouth ignores --no-boot-log flag

[Daniel van Vugt]

*** This bug is a duplicate of bug 1970069 ***
    https://bugs.launchpad.net/bugs/1970069

The exact log messages are irrelevant. And where they come from is also
probably irrelevant, be it kernel or daemons. Please feel free to
generalize the description of bug 1970069.

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https://bugs.launchpad.net/bugs/1975421

Title:
  Make Plymouth hide ALL messages on boot, reboot, halt. Plymouth
  ignores --no-boot-log flag

Status in plymouth package in Ubuntu:
  New

Bug description:
  running a fresh install of kubuntu 22.04 
  plymouth version: 0.9.5+git20211018-1ubuntu3

  
  What should happen:  
  Plymouth should totally cover all bootmessages (no bootmessages should be printed to console in the first place)

  What actually happens: 
  When Plymouth quits the last 2-3 messages are visible

  on shutdown i get:
  [OK] Reached target Late Shutdown Services
  [OK] Finished System Power Off
  [OK] Reached target System Power off


  it seems to be absolutely impossible to hide all boot messages 
  i've done everything from this arch wiki site (and more) to get a silent boot: https://wiki.archlinux.org/title/silent_boot
  (this makes all acpi warnings and more go away.. but the [OK] reached/finished messages are not affected by those kernel parameters (this should also be fixed)

  My Kernelparameters: 
  fbcon=nodefer rd.systemd.show_status=false vt.global_cursor_default=0 quiet splash loglevel=3 rd.udev.log_level=3


  What part of the system throws these messages ? i thought it is systemd? 
  so i even edited files in /usr/lib/systemd/system in order to set the StandardOutput to null for all of the halt and reboot and plymouth scripts

  and i edited the plymouth start and stop scripts and added -no-boot-
  log but plymouth totally ignores this flag and still logs everything
  to console and to /var/log/boot.log

  
  this defies the whole purpose of plymouth if plymouth itself spams the console with messages and if it's systemd why doesn't it respect the kernel parameters

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