[Bug 1766095] Re: plymouthd constantly uses 5% of CPU

[Henning]

See the same bug on my HP Spectre x360 15t.

plymouthd consistently consumes over 20% CPU resources while mostly
waiting:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                             
  487 root      20   0  172488  45328   9900 R  22.6  0.1 156:40.10 plymouthd                                           

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
➜ time sudo strace -p487 -c

strace: Process 487 attached
^Cstrace: Process 487 detached
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 97.29    0.012121           2      5542           epoll_wait
  1.47    0.000183           6        31           write
  0.80    0.000100           3        31           read
  0.44    0.000055           2        31        31 sendto
------ ----------- ----------- --------- --------- ----------------
100.00    0.012459                  5635        31 total
sudo strace -p487 -c  0.14s user 0.29s system 2% cpu 19.240 total

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Title:
  plymouthd constantly uses 5% of CPU

Status in plymouth package in Ubuntu:
  Confirmed

Bug description:
  After a fresh boot plymouthd constantly uses 5% of CPU. Noticed this
  because my laptop fun will not shut up, something that was not true
  before some recent routine software update.

  This report exists: https://bugs.launchpad.net/ubuntu/+source/kde-
  workspace/+bug/1240376 , this one is reported fixed. Strange that I to
  see 5.0% CPU.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: plymouth 0.9.2-3ubuntu13.4
  ProcVersionSignature: Ubuntu 4.4.0-119.143-generic 4.4.114
  Uname: Linux 4.4.0-119-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.16
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Apr 22 07:58:29 2018
  DefaultPlymouth: /usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth
  InstallationDate: Installed on 2017-02-19 (426 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  MachineType: Dell Inc. Dell System XPS 15Z
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-119-generic root=UUID=f3fecda3-35d3-4e43-a14d-c7d685310d79 ro quiet splash vt.handoff=7
  ProcFB:
   0 inteldrmfb
   1 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-119-generic root=UUID=f3fecda3-35d3-4e43-a14d-c7d685310d79 ro quiet splash vt.handoff=7
  SourcePackage: plymouth
  TextPlymouth: /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/07/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A12
  dmi.board.name: 060G42
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA12:bd09/07/2012:svnDellInc.:pnDellSystemXPS15Z:pvr:rvnDellInc.:rn060G42:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS 15Z
  dmi.sys.vendor: Dell Inc.

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