Public bug reported:

The behavior is the same booting from USB to install the OS, and booting
from NVMe on an installed OS. I'm using disk encryption, but I don't
believe it plays a factor.

When I boot plugged in to power, the system behaves normally, even once
battery is disconnected. I can put the system to sleep on battery, wake
on battery, and everything is fine. The initial boot on battery just
does not seem happy either way. I've tried both with and without TLP
installed.

This behavior was present on 18.04, but I assumed it was an "old kernel"
issue as this is fairly new hardware. I was previously on Manjaro w/
kernel 5.4, and the system was fine, but using Focal Fossa on kernel 5.4
presents the boot issue.

It appears to get through most of the boot process but I don't ever see
the login screen, it sits hung at a black screen and a mouse. Overall
the boot process itself feels very sluggish.

Please let me know if there's more information I can provide - thank
you!

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-21-generic 5.4.0-21.25
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
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  lyndon     1871 F.... pulseaudio
 /dev/snd/controlC0:  lyndon     1871 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Apr 13 11:18:18 2020
InstallationDate: Installed on 2020-04-03 (10 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
MachineType: Dell Inc. Inspiron 5585
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-21-generic 
root=/dev/mapper/vgubuntu-root ro quiet splash
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-21-generic N/A
 linux-backports-modules-5.4.0-21-generic  N/A
 linux-firmware                            1.187
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/12/2019
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.4.4
dmi.board.name: 0N999T
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 2.4.4
dmi.modalias: 
dmi:bvnDellInc.:bvr2.4.4:bd11/12/2019:svnDellInc.:pnInspiron5585:pvr2.4.4:rvnDellInc.:rn0N999T:rvrA00:cvnDellInc.:ct10:cvr2.4.4:
dmi.product.family: Inspiron
dmi.product.name: Inspiron 5585
dmi.product.sku: 092B
dmi.product.version: 2.4.4
dmi.sys.vendor: Dell Inc.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1872510

Title:
  Slow / Broken Boot on Battery Power

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