[Bug 1872510] Re: Slow / Broken Boot on Battery Power

I've worked around whatever bug by forcing iommu to soft

~$ grep GRUB_CMDLINE_LINUX_DEFAULT /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash iommu=soft"

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

Title:
Slow / Broken Boot on Battery Power

Status in linux package in Ubuntu:
Confirmed

Bug description:
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.

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