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[Launchpad Bug Tracker <1475914@xxxxxxxxxxxxxxxxxx>]

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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.

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete

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login freezes or black screen with kernel higher than 3.19.0-15
https://bugs.launchpad.net/bugs/1475914
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