I have the same problem and I always thought it was the NVIDIA drivers themselves.
Tried all the newer versions from "xorg-edgers", as well as the latest upstream Linux kernels (4.x+) and none of it helped. Finally came across the NVIDIA devtalk post linked in the description of this bug report and then found this bug report itself. The workaround mentioned by Rene works for me. I want to help fix this, but I have no idea where to start. So I'm just going to start with the X.org dev patch that Aaron made and maybe get in contact with him. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1449560 Title: Cannot login with Nvidia Optimus hardware installed(Ubuntu 15.04) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1449560/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
