[Bug 1861470] Re: BIOS logo reappears mid-boot after the purple screen

[Dimitri John Ledkov]

This is an improvement!

Previously, during that time period the whole display (at least on
laptops) would be powered off and people saw a temporary backlight
flicker.

With this in place we might be able to to implement a flickerfree boot!

I will double check what we need to change in the theme to ensure our
boot now has less flicker.

Please keep the kernel as is, and we will tweak the themes to behave
better.

** Also affects: plymouth (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1861470

Title:
  BIOS logo reappears mid-boot after the purple screen

Status in grub2 package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed
Status in linux-signed-5.4 package in Ubuntu:
  Confirmed
Status in plymouth package in Ubuntu:
  New

Bug description:
  BIOS logo (the ACPI BGRT graphic) reappears mid-boot after the purple
  screen.

  This seems to be happening reliably on multiple focal machines:

  0. Turn on or reboot the machine.
  1. See the BIOS logo.
  2. See a blank purple screen (grub)
  3. See the BIOS logo again (this bug)
  4. See the purple screen with Ubuntu logo (plymouth)
  5. See the login screen

  I believe this is related to ACPI BGRT changes in the kernel. And I
  guess it wouldn't even need fixing if we just eliminated the blank
  purple grub screen (step 2)...

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-12-generic 5.4.0-12.15
  ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
  Uname: Linux 5.4.0-12-generic x86_64
  ApportVersion: 2.20.11-0ubuntu16
  Architecture: amd64
  Date: Fri Jan 31 11:31:44 2020
  InstallationDate: Installed on 2020-01-30 (0 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200124)
  SourcePackage: linux-signed-5.4
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu16
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dan        1316 F.... pulseaudio
  DistroRelease: Ubuntu 20.04
  InstallationDate: Installed on 2020-01-30 (0 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200124)
  MachineType: LENOVO 20KFCTO1WW
  Package: linux-signed-5.4
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-12-generic root=UUID=50f3b272-d351-4a2a-9661-d39e9fcf2195 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-12-generic N/A
   linux-backports-modules-5.4.0-12-generic  N/A
   linux-firmware                            1.185
  Tags:  focal
  Uname: Linux 5.4.0-12-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 01/10/2020
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N20ET51W (1.36 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20KFCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrN20ET51W(1.36):bd01/10/2020:svnLENOVO:pn20KFCTO1WW:pvrThinkPadX280:rvnLENOVO:rn20KFCTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad X280
  dmi.product.name: 20KFCTO1WW
  dmi.product.sku: LENOVO_MT_20KF_BU_Think_FM_ThinkPad X280
  dmi.product.version: ThinkPad X280
  dmi.sys.vendor: LENOVO

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