This still happens on 15.04. I have a ThinkPad E540 with Optimus graphics. Plugging in a HDMI display causes display to go blank.
I found this blog posting which explains that the issue is related to gpu-manager not working correctly: http://vxlabs.com/2015/02/05/solving-the-ubuntu-14-04-nvidia-346-nvidia- prime-black-screen-issue/ This bug is a serious for people using laptops with NVidia Optimus as it's not possible to connect a HDMI monitor to the device. The solution in post above is way too complicated to be a good workaround. -- 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/1419507 Title: gpu-manager writes wrong driver in xorg.conf fro nvidia-prime Status in ubuntu-drivers-common 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 : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
