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[Bug 1475914] Re: login freezes or black screen with kernel higher than 3.19.0-15

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: "Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>
Date: Sat, 26 Sep 2015 18:41:54 -0000
Reply-to: Bug 1475914 <1475914@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Pierre, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect 1475914

When reporting bugs in the future please use apport by using 'ubuntu-
bug' and the name of the package affected. You can learn more about this
functionality at https://wiki.ubuntu.com/ReportingBugs.

** Package changed: xserver-xorg-video-ati (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1475914

Title:
  login freezes or black screen with kernel higher than 3.19.0-15

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Env :
  Linux 3.19.0-22-generic #15-Ubuntu SMP Thu Apr 16 23:32:37 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
  VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde XT [Radeon HD 7770/8760 / R7 250X]
  using xorg default driver (not the proprietary)

  Facts :
  - On the login page, just after the boot, the system is freezed (or looping)
  - I can't open a terminal with Ctrl+Alt+F1
  - When I choose a previous kernel version from Grub, the problem occurs with all versions I had installed since 3.19.0-16
  3.19.0-15   OK
  3.19.0-16   KO
  3.19.0-18   KO
  3.19.0-20   KO
  3.19.0-21   KO
  3.19.0-22   KO
  - When I choose the recovery mode of the version that have the problem, the recovery menu freezes also (see attachment)
  - I've done a clean install on a new disk and after the update of the kernel (3.19.0-15 -> 3.19.0-22) I have a black screen after the boot (no login screen). And I have the same problem trying the recovery mode with version 3.19.0-22.

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