Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.7-rc1/
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1868534
Title:
Ubuntu 18.04.4 boot stops at 'loading initial ramdisk' when AC is
unplugged.
Status in linux package in Ubuntu:
Incomplete
Bug description:
With AC plugged everything works.
With the AC plugged I can start the computer and just after the Ubuntu logo
appears I can unplug the AC. After the Ubuntu logo everything works fine
without AC.
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ProblemType: Bug
ApportVersion: 2.20.9-0ubuntu7.12
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: pep 2001 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 18.04
InstallationDate: Installed on 2020-03-03 (20 days ago)
InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64
(20200203.1)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 8087:0aaa Intel Corp.
Bus 001 Device 002: ID 0bda:5650 Realtek Semiconductor Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. Latitude 5491
NonfreeKernelModules: nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-42-generic
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
ProcVersionSignature: Ubuntu 5.3.0-42.34~18.04.1-generic 5.3.18
RelatedPackageVersions:
linux-restricted-modules-5.3.0-42-generic N/A
linux-backports-modules-5.3.0-42-generic N/A
linux-firmware 1.173.16
Tags: bionic
Uname: Linux 5.3.0-42-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare scanner sudo www-data
_MarkForUpload: True
dmi.bios.date: 11/11/2019
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.11.1
dmi.board.name: 0WCMKT
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.11.1:bd11/11/2019:svnDellInc.:pnLatitude5491:pvr:rvnDellInc.:rn0WCMKT:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: Latitude
dmi.product.name: Latitude 5491
dmi.product.sku: 0818
dmi.sys.vendor: Dell Inc.
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