Switching user brings black X screen //nouveau

Bug #1273162 reported by kao
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Light Display Manager
Incomplete
Undecided
Unassigned

Bug Description

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

Tags: trusty
Revision history for this message
kao (kao1985) wrote :
affects: xserver-xorg-video-nouveau (Ubuntu) → ubuntu
Revision history for this message
John Kim (kotux) wrote :

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect BUGNUMBER
When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

tags: added: trusty
Changed in ubuntu:
status: New → Incomplete
affects: ubuntu → lightdm
Revision history for this message
kao (kao1985) wrote :

Hi, apport-collect says
>apport-collect 1273162
>>No additional information collected.

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