Public bug reported:

lsb_release :
Description:    Ubuntu 18.04.1 LTS
Release:        18.04

What you expected to happen ?
Boot successfully.

What happened instead ?
After selecting Ubuntu in the grub menu, I am greeted with a black screen that 
flashes text and the computer reboots. This keeps happening until I edit the 
boot parameters and add radeon.dpm=0.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7.1
Uname: Linux 4.17.14-041714-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sun Aug 12 00:25:06 2018
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Trinity [Radeon HD 7660D] [1002:9901] 
(prog-if 00 [VGA controller])
   Subsystem: Micro-Star International Co., Ltd. [MSI] Trinity [Radeon HD 
7660D] [1462:7721]
InstallationDate: Installed on 2018-08-11 (0 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
MachineType: MSI MS-7721
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.17.14-041714-generic 
root=UUID=ee4b6e27-d6ff-4335-a4f0-a9aa0e42817f ro quiet splash radeon.dpm=0
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/15/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V30.6
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: A88XM-E35 (MS-7721)
dmi.board.vendor: MSI
dmi.board.version: 6.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: MSI
dmi.chassis.version: 6.0
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrV30.6:bd12/15/2014:svnMSI:pnMS-7721:pvr6.0:rvnMSI:rnA88XM-E35(MS-7721):rvr6.0:cvnMSI:ct3:cvr6.0:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: MS-7721
dmi.product.version: 6.0
dmi.sys.vendor: MSI
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.93+git1808090630.879d7c~oibaf~b
version.libgl1-mesa-dri: libgl1-mesa-dri 18.3~git1808111930.a9f7bc~oibaf~b
version.libgl1-mesa-glx: libgl1-mesa-glx 18.3~git1808111930.a9f7bc~oibaf~b
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:18.0.99+git1808031933.740f08~oibaf~b
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git1807201025.3d3950~oibaf~b
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.15+git1807201019.ac8f7b~oibaf~b

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic false-gpu-hang freeze third-party-packages 
ubuntu

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https://bugs.launchpad.net/bugs/1786647

Title:
  Unable to boot Ubuntu 18.04.1 without radeon.dpm set to 0

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