Possible duplicate of 1248948.
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https://bugs.launchpad.net/bugs/1256150
Title:
Xorg guest session fails to start if the user has logged out and
logged in again
Status in Light Display Manager:
Fix Released
Status in Light Display Manager 1.8 series:
Fix Released
Status in “lightdm” package in Ubuntu:
Fix Released
Status in “lightdm” source package in Saucy:
Fix Committed
Status in “lightdm” source package in Trusty:
Fix Released
Bug description:
[Impact]
Unable to switch sessions.
[Test Case]
1. Log in to the desktop.
2. Log out again. (But don't reboot or anything like that.)
3. Log in again.
4. Start a guest session.
Result: Depends on Xorg server in use. With intel driver, the guest
Xorg session fails to start up with a DRM permission error (see
attached Xorg.1.log). With virtualbox, and possibly AMD proprietary
driver, the Xorg session on :1 appears to fight the one on :0 for
control of the framebuffer - windows from both desktops get drawn over
each other, causing a big mess.
The login/logout step is important: if you log in to the desktop
immediately after the lightdm session has been started or restarted
("sudo service lightdm restart"), then the :1 session will start
correctly.
(This problem can also be reproduced in another way: some desktops,
when locking the display, create a new greeter instance on :1. This
will also fail if the user has logged out and logged in again. For
example, Xubuntu does this.)
[Regression Potential]
Low. Bug is a simple fix for wrong logic and has been running in Ubuntu 14.04
for some time without issue.
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