[Bug 1965968] Re: post jammy update, black/flickering screen on boot

[Joe Barnett]

kernel parameter intel_idle.max_cstate=4 does not help.

Things do work properly if I boot with the external display plugged in
to begin with.

It does appear that blindly typing the encrypted disk password still
"works" and gdm does end up starting behind the black screen, but the
display does not fix itself until plugging in an external monitor.

booting with kernel 5.13.0-35 does not exhibit the bug (but uses the
previously configured ubuntu-gnome plymouth graphics instead of the new
spinner ones).

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https://bugs.launchpad.net/bugs/1965968

Title:
  post jammy update, black/flickering screen on boot

Status in plymouth package in Ubuntu:
  New

Bug description:
  After initial jammy upgrade things were working fine, but after a
  recent update the machine boots to a blank screen.  There are
  occasional purplish flickers that seem to correspond with keypresses,
  but even blindly typing the encrypted disk password doesn't appear to
  advance the boot process to gdm.

  Plugging in an external monitor does fix the issue and allow boot to
  proceed, but obviously doesn't help if not near an external monitor.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: plymouth 0.9.5+git20211018-1ubuntu3
  ProcVersionSignature: Ubuntu 5.15.0-23.23-generic 5.15.27
  Uname: Linux 5.15.0-23-generic x86_64
  ApportVersion: 2.20.11-0ubuntu79
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: unknown
  CurrentDesktop: GNOME
  Date: Tue Mar 22 09:22:26 2022
  DefaultPlymouth: /usr/share/plymouth/themes/bgrt/bgrt.plymouth
  InstallationDate: Installed on 2019-08-17 (948 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190305.1)
  MachineType: Dell Inc. XPS 15 9575
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-23-generic root=UUID=83cade14-7628-437d-8517-36ad82f00d20 ro quiet splash vt.handoff=7
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-23-generic root=UUID=83cade14-7628-437d-8517-36ad82f00d20 ro quiet splash vt.handoff=7
  SourcePackage: plymouth
  TextPlymouth: /usr/share/plymouth/themes/ubuntu-gnome-text/ubuntu-gnome-text.plymouth
  UpgradeStatus: Upgraded to jammy on 2022-03-18 (3 days ago)
  dmi.bios.date: 03/25/2021
  dmi.bios.release: 1.15
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.15.1
  dmi.board.name: 0N338G
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 31
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr1.15.1:bd03/25/2021:br1.15:svnDellInc.:pnXPS159575:pvr:rvnDellInc.:rn0N338G:rvrA00:cvnDellInc.:ct31:cvr:sku080D:
  dmi.product.family: XPS
  dmi.product.name: XPS 15 9575
  dmi.product.sku: 080D
  dmi.sys.vendor: Dell Inc.

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