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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1743427

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/1743427

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

Status in linux package in Ubuntu:
  Incomplete

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

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