I just ran into this issue yesterday with a fresh install of Xubuntu 14.04.4 on a machine with nVidia 650m video. I can blindly type in password and then get to lightdm session when in nVidia mode. Switching to Intel mode the login works as it should. I'm able to run this way for now, but it's a show stopper issue for the average user.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1419507 Title: gpu-manager writes wrong driver in xorg.conf fro nvidia-prime Status in ubuntu-drivers-common package in Ubuntu: Invalid Status in xserver-xorg-video-intel package in Ubuntu: Confirmed Bug description: The driver for the intel part of xorg.conf should be modesetting instead of intel, see also: https://askubuntu.com/questions/580693 /black-screen-when-in-nvidia-mode-after-updating-to-kernel-3-13-0-45 From what I can see this is set here: http://bazaar.launchpad.net /~ubuntu-branches/ubuntu/trusty/ubuntu-drivers-common/trusty- proposed/view/head:/share/hybrid/gpu-manager.c#L1588 I am seeing this on a trusty system with nvidia-346 driver on both 3.16 and 3.13 kernels. The end result of doing this worng is that system boots up with black screen. As a workaround I have commented out gpu-manager in /etc/init/gpu- manager.conf (when starting lightdm) and in /sbin/prime-switch (when stopping lightdm). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-drivers-common/+bug/1419507/+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
