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 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1475914/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp