apport information

** Attachment added: "Lspci.txt"
   https://bugs.launchpad.net/bugs/1743427/+attachment/5037465/+files/Lspci.txt

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https://bugs.launchpad.net/bugs/1743427

Title:
  Black screen with iMac 2011 and ATI Radeon 6970M

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Dear community!

  I have installed Ubuntu 17.10 (also tried 17.04 and 16.04), and the
  system gets a black screen on boot with all tested Ubuntu versions.
  Also ping and ssh to the host does not work. The fan's are running,
  the screen is black and nothing more.

  When i insert in Grub nomodeset, the system can boot.

  I have also tested Kernel 4.14 and 4.15RC7.

  Hardware Information:

  00:02.0 Display controller: Intel Corporation 2nd Generation Core
  Processor Family Integrated Graphics Controller (rev 09)

  01:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
  [AMD/ATI] Blackcomb [Radeon HD 6970M/6990M]

  
  Thanks for help or any hint.

  Best regards,

  Hans
  --- 
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  christian   1756 F.... pulseaudio
   /dev/snd/controlC1:  christian   1756 F.... pulseaudio
  DistroRelease: Ubuntu 17.10
  HibernationDevice: RESUME=/dev/mapper/storage-swap
  InstallationDate: Installed on 2018-01-15 (0 days ago)
  InstallationMedia: Ubuntu-Server 17.10 "Artful Aardvark" - Release amd64 
(20180108.1)
  MachineType: Apple Inc. iMac12,2
  Package: linux (not installed)
  ProcEnviron:
   LANGUAGE=
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-25-generic.efi.signed 
root=/dev/mapper/storage-root ro rootflags=subvol=@ nomodeset
  ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-25-generic N/A
   linux-backports-modules-4.13.0-25-generic  N/A
   linux-firmware                             1.169.1
  Tags:  artful
  Uname: Linux 4.13.0-25-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 08/08/17
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: IM121.88Z.004D.B00.1708080012
  dmi.board.name: Mac-942B59F58194171B
  dmi.board.vendor: Apple Inc.
  dmi.board.version: iMac12,2
  dmi.chassis.type: 13
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-942B59F58194171B
  dmi.modalias: 
dmi:bvnAppleInc.:bvrIM121.88Z.004D.B00.1708080012:bd08/08/17:svnAppleInc.:pniMac12,2:pvr1.0:rvnAppleInc.:rnMac-942B59F58194171B:rvriMac12,2:cvnAppleInc.:ct13:cvrMac-942B59F58194171B:
  dmi.product.family: iMac
  dmi.product.name: iMac12,2
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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