[Bug 1872159] Re: booting with splash hangs when external monitors are connected (pure intel 8th gen laptop)

[Colin Brash]

Steps to reproduce
This result was consistent after five different installs. 

Outcome
I'm having the same issue, after install I shut down remove the usb it will boot the first time to login screen no problem, after a second shut down or restart it hangs at the spinning arrow.

Expected Outcome
Smooth start up with boot splash to login screen.

Workaround
Tap the F8 key before boot splash appears, continue to tap F8 when scrolling text appears, it then continues to login screen.

Temporary Fix
Remove "quiet splash" from /etc/default/grub - GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

Result
Scrolling text on startup, however a very quick boot to login screen, no hanging.

System info taken from  gnome-initial-setup 
{
  "Version": "20.04",
  "BIOS": {
    "Vendor": "American Megatrends Inc.",
    "Version": "KYSKLi70.86A.0037.2016.0603.1032"
  },
  "CPU": {
    "OpMode": "32-bit, 64-bit",
    "CPUs": "8",
    "Threads": "2",
    "Cores": "4",
    "Sockets": "1",
    "Vendor": "GenuineIntel",
    "Family": "6",
    "Model": "94",
    "Stepping": "3",
    "Name": "Intel(R) Core(TM) i7-6770HQ CPU @ 2.60GHz",
    "Virtualization": "VT-x"
  },
  "Arch": "amd64",
  "GPU": [
    {
      "Vendor": "8086",
      "Model": "193b"
    }
  ],
  "RAM": 32.8,
  "Partitions": [
    230.5,
    0.5
  ],
  "Screens": [
    {
      "Size": "509mmx286mm",
      "Resolution": "1920x1080",
      "Frequency": "60.00"
    },
    {
      "Size": "477mmx268mm",
      "Resolution": "1920x1080",
      "Frequency": "60.00"
    }
  ],
  "Autologin": false,
  "LivePatch": false,
  "Session": {
    "DE": "ubuntu:GNOME",
    "Name": "ubuntu",
    "Type": "x11"
  },
  "Language": "en_AU",
  "Timezone": "Australia/Perth",
  "Install": {
    "Media": "Ubuntu 20.04 LTS \"Focal Fossa\" - Release amd64 (20200423)",
    "Type": "GTK",
    "OEM": false,
    "PartitionMethod": "manual",
    "DownloadUpdates": true,
    "Language": "en",
    "Minimal": false,
    "RestrictedAddons": true,
    "Stages": {
      "0": "language",
      "10": "console_setup",
      "13": "prepare",
      "22": "partman",
      "34": "partman",
      "35": "partman",
      "50": "partman",
      "51": "partman",
      "67": "partman",
      "106": "partman",
      "110": "start_install",
      "124": "timezone",
      "181": "usersetup",
      "204": "user_done",
      "409": "done"
    }
  }
}

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https://bugs.launchpad.net/bugs/1872159

Title:
  booting with splash hangs when external monitors are connected (pure
  intel 8th gen laptop)

Status in plymouth package in Ubuntu:
  Confirmed

Bug description:
  I think this is a problem with the splash boot loader. This problem is
  not reproduced if using nosplash.

  I have installed 20.04 to this laptop. Thinkpad T480, i7, intel
  graphics.

  Clean install of 20.04 beta, not an upgrade.
  When booting from the install, the greeter screen is never reached if external monitors are connected at startup.
  I get the spinning ubuntu logo, and nothing more. I can not change to virtual terminals. The fsck step does not commence.

  In recovery mood, I can log in.

  With no external monitors attached, it works.

  I am used to having such problems with Nvidia graphics is involved,
  but this is not the case on this laptop. It has been happily running
  18.04.

  External displays are recognised if they are connected after login.

  Also, when I edit /etc/default/grub so that it reads
  GRUB_CMDLINE_LINUX_DEFAULT=""
  (that is, splash disabled)
  it works fine with two external monitors attached.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  ApportVersion: 2.20.11-0ubuntu26
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Apr 11 13:58:19 2020
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  DkmsStatus:
   acpi-call, 1.1.0, 5.4.0-21-generic, x86_64: installed
   tp_smapi, 0.43, 5.4.0-21-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA controller])
     Subsystem: Lenovo UHD Graphics 620 [17aa:225d]
  InstallationDate: Installed on 2020-04-10 (0 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
  MachineType: LENOVO 20L5S00F00
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic root=/dev/mapper/myvg-root ro
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/19/2020
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N24ET56W (1.31 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20L5S00F00
  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:bvrN24ET56W(1.31):bd02/19/2020:svnLENOVO:pn20L5S00F00:pvrThinkPadT480:rvnLENOVO:rn20L5S00F00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad T480
  dmi.product.name: 20L5S00F00
  dmi.product.sku: LENOVO_MT_20L5_BU_Think_FM_ThinkPad T480
  dmi.product.version: ThinkPad T480
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.101-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 20.0.4-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.7-2ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20190815-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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