I'm experiencing this bug after upgrading from kubuntu 14.10 to 15.04 using the update manager.
Using nvidia-346: Booting with a previous kernel (3.16) works but I'm stuck in intel mode. Booting with current kernel (3.19) leaves me with the black screen which can be fixed (until restart) by running the suggested: sudo systemctl stop sddm sudo systemctl start gpu-manager sudo systemctl start sddm Idk if its relevant but gpu-manager.conf : start on (starting lightdm or starting gdm or starting kdm or starting xdm or starting lxdm) task exec gpu-manager --log /var/log/gpu-manager.log Tried the obvious and added a line "or starting sddm" but didn't work :P ** Attachment added: "dpkg -s ubuntu-drivers-common.txt" https://bugs.launchpad.net/ubuntu/+source/ubuntu-drivers-common/+bug/1443364/+attachment/4383102/+files/dpkg%20-s%20ubuntu-drivers-common.txt -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to ubuntu-drivers-common in Ubuntu. https://bugs.launchpad.net/bugs/1443364 Title: gpu-manager systemd unit is not enabled Status in ubuntu-drivers-common package in Ubuntu: Fix Released Bug description: This happened with today's 15.04 image. The gpu-manager unit started, the xorg.conf was written, and so was the log but, somehow, even though the log says that the system needs offloading, no /var/lib /ubuntu-drivers-common/requires_offloading was created. This caused the system to boot into a black screen. Starting the same unit after (the failure to) boot, resulted in the correct creation of /var/lib/ubuntu-drivers- common/requires_offloading . There is probably something weird going on in the systemd unit, as gpu-manager has never behaved like this with Upstart. This breaks hybrid graphics. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: ubuntu-drivers-common 1:0.4.4 ProcVersionSignature: Ubuntu 3.19.0-13.13-generic 3.19.3 Uname: Linux 3.19.0-13-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.17-0ubuntu2 Architecture: amd64 CurrentDesktop: KDE Date: Mon Apr 13 12:38:53 2015 InstallationDate: Installed on 2015-04-13 (0 days ago) InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150413) SourcePackage: ubuntu-drivers-common UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-drivers-common/+bug/1443364/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp