[Bug 1871637] Re: [flicker free boot] boot image disappears for a second before LUKS prompt

[Luis Alberto Pabón]

dmesg with `quiet splash drm.debug=0x4 log_buf_len=10M plymouth:debug`
boot

** Attachment added: "dmesg.txt"
   https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1871637/+attachment/5350319/+files/dmesg.txt

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Title:
  [flicker free boot] boot image disappears for a second before LUKS
  prompt

Status in plymouth package in Ubuntu:
  Incomplete

Bug description:
  The display goes black at some point after BIOS boot and LUKS prompt,
  where original boot image is restored alongside Ubuntu's boot bits.

  Best shown in a video: https://www.youtube.com/watch?v=YUtlE6YkFuk

  Dell XPS 9560

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: plymouth 0.9.4git20200323-0ubuntu5
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  ApportVersion: 2.20.11-0ubuntu24
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CurrentDesktop: Unity
  Date: Wed Apr  8 14:17:01 2020
  DefaultPlymouth: /usr/share/plymouth/themes/bgrt/bgrt.plymouth
  InstallationDate: Installed on 2019-08-17 (234 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  MachineType: Dell Inc. XPS 15 9560
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-21-generic root=/dev/mapper/vglinux-root ro quiet splash vt.handoff=7
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-21-generic root=/dev/mapper/vglinux-root ro quiet splash vt.handoff=7
  SourcePackage: plymouth
  TextPlymouth: /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
  UpgradeStatus: Upgraded to focal on 2020-03-31 (7 days ago)
  dmi.bios.date: 11/17/2019
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.18.0
  dmi.board.name: 05FFDN
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr1.18.0:bd11/17/2019:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn05FFDN:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 15 9560
  dmi.product.sku: 07BE
  dmi.sys.vendor: Dell Inc.

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