This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1768162
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1768162
Title:
kernel crashes during boot unless IOMMU is disabled on AMD Cpu
Status in linux package in Ubuntu:
Incomplete
Bug description:
Previous
- IOMMU was enabled under Ubuntu 16.04 LTS Kernel 4.4 - No Issues
Current
- After upgrading to 18.04 with kernel 4.15 systems crashes with IOMMU
enabled
- Disabling IOMMU within the BIOS allow booting with 4.15 kernel
- Enabling IOMMU and switching to 4.4 boots fine as well under 18.04
Not Sure if this is the same as bug 1747463
Version Log
Ubuntu 4.15.0-20.21-generic 4.15.17
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-20-generic 4.15.0-20.21
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Apr 30 20:05:32 2018
InstallationDate: Installed on 2015-06-11 (1054 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-signed
UpgradeStatus: No upgrade log present (probably fresh install)
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