Public bug reported:
Environment
Ubuntu 14.04, lightdm, unity
The problem occurs while trying to switch to another running user session. It
brings black X screen instead of password prompt window.
Steps to reproduce:
1. Login as user1 //creates X on vt7
2. Switch to new user session for user2 //creates X on vt8
3. Try to switch to user1 session via indicator-session //creates X on vt9 with
black screen
This bug is similiar to a bunch of registered bugs related to incorrect file
permissions.
But none of advices helped.
I found out that only blacklisting of nouveau kernel module helps
I attached logs from /var/log/lightdm
** Affects: ubuntu
Importance: Undecided
Status: New
** Attachment added: "ligthdm log"
https://bugs.launchpad.net/bugs/1273162/+attachment/3958799/+files/lightdm_log.tgz
** Package changed: xserver-xorg-video-nouveau (Ubuntu) => ubuntu
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https://bugs.launchpad.net/bugs/1273162
Title:
Switching user brings black X screen //nouveau
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