Public bug reported:
After issuing a software reboot, the machine hangs at a black screen
after the grub prompt, before the kernel boots. This lasts at least five
minutes, with the processor fans spun all the way up. If I remove quiet
and nosplash there is no text, the screen is completely black.
I have tried various reboot= options but it behaves the same way (when
it reboots--some of those options do not reboot at all). If I add
acpi=off it will boot reliably, but with acpi=ht the same problem
occurs.
Once at the black screen, I can press the reset button, and after going
through grub, the machine boots successfully. It also boots successfully
on a cold boot.
I am using UEFI, but I had the same problem with BIOS boot.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.8.0-63-generic 5.8.0-63.71~20.04.1
ProcVersionSignature: Ubuntu 5.8.0-63.71~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-63-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Jul 22 20:51:41 2021
InstallationDate: Installed on 2021-07-18 (4 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: linux-signed-hwe-5.8
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-signed-hwe-5.8 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
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https://bugs.launchpad.net/bugs/1937324
Title:
hang booting kernel after software reboot
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