Problems with upstart user sessions in Flashback session

[Dmitry Shachnev]

Hi,

In GNOME Flashback, we are experiencing a strange bug with Upstart user sessions.

When our session name (gnome-flashback-metacity) is in /etc/upstart-xsessions,
lightdm doesn't even attempt to start the application from session file's Exec:
field.

Instead, it looks like it spawns `upstart --user' and nothing else (the relevant
piece of `ps axf' is attached). From the user's point of view, the system
hangs with LightDM background on the screen.

When commenting out the session name from /etc/upstart-xsessions, it starts
/usr/lib/gnome-flashback/gnome-flashback-metacity as it should.

When I start a minimal X environment and execute `upstart --user --verbose'
from there, I don't see any error messages, just normal log.

I should also add that everything worked fine in Utopic. In Vivid, we recently
changed the sessions names, and after fixing their names in upstart-xsessions
got the problem.

Can anyone suggest me what can cause the issue, and how can I debug it?

--
Dmitry Shachnev

Please keep me CC-ed as I am not subscribed to the list.
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