** Attachment added: "dmesg from kernel 4.4 with drm.debug=15" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1651910/+attachment/4795002/+files/dmesg4.4.out
-- 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/1651910 Title: radeon: black screen after upgrade from 14.04 to 16.04 on RS780 Status in linux package in Ubuntu: Confirmed Bug description: After upgrading from Ubuntu 14.04 to 16.04, the screen will stay black after GRUB (backlight is on) when booting with the new 4.4 kernel (linux-image-4.4.0-57-generic). Booting with the old 3.14 kernel will make the screen work again. This is on a BIOSTAR A780L mainboard, with the monitor connected via DVI. "ubuntu-bug linux" tells me that I appear to run a mainline kernel and cannot report anything (obviously, as the screen doesn't work if I boot the 16.04 kernel). $ cat /proc/version_signature > version.log cat: /proc/version_signature: No such file or directory 1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu $ lsb_release -rd Description: Ubuntu 16.04.1 LTS Release: 16.04 2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center $ apt-cache policy linux-image-4.4.0-57-generic linux-image-4.4.0-57-generic: Installed: 4.4.0-57.78 Candidate: 4.4.0-57.78 Version table: *** 4.4.0-57.78 500 500 http://de.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages 100 /var/lib/dpkg/status 3) What you expected to happen Screen doesn't stay black 4) What happened instead Screen stays black --- ApportVersion: 2.20.1-0ubuntu2.4 Architecture: amd64 CurrentDesktop: KDE DistroRelease: Ubuntu 16.04 Package: xorg 1:7.7+13ubuntu3 PackageArchitecture: amd64 Tags: xenial Uname: Linux 3.14.79-031479-generic x86_64 UpgradeStatus: Upgraded to xenial on 2016-09-24 (88 days ago) UserGroups: adm admin cdrom dialout lpadmin nopasswdlogin plugdev sambashare _MarkForUpload: True To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1651910/+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
