** Also affects: ubuntu
Importance: Undecided
Status: New
** Package changed: ubuntu => lightdm (Ubuntu)
** Also affects: lightdm (Ubuntu Trusty)
Importance: Undecided
Status: New
** Also affects: lightdm (Ubuntu Utopic)
Importance: Undecided
Status: New
** Changed in: lightdm (Ubuntu Utopic)
Status: New => Fix Released
** Changed in: lightdm (Ubuntu Utopic)
Importance: Undecided => Wishlist
** Changed in: lightdm (Ubuntu Trusty)
Importance: Undecided => Wishlist
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https://bugs.launchpad.net/bugs/1350357
Title:
Support disabling of user switching per seat
Status in Light Display Manager:
Fix Released
Status in Light Display Manager 1.10 series:
Fix Committed
Status in “lightdm” package in Ubuntu:
Fix Released
Status in “lightdm” source package in Trusty:
New
Status in “lightdm” source package in Utopic:
Fix Released
Bug description:
Let me start by saying it's possible I'm missing some subtleties here,
and if so, I'd be happy to get a more detailed explanation.
In LightDM 1.10.1 (Trusty), unity seats are forced to enable user
switching (in seat-unity.c). However, I think this is something that
should be configurable in the display manager. In a public computing
environment, fast-user-switching is undesirable, as it interferes with
serial re-usability and various cleanup tasks. Most public computing
labs want to maintain a 1-1 relationship between individuals and
workstations, and a workstation should either be in use by one user,
or not in use at all. In the past, our site has accomplished this in
various desktop environment configurations (such as the
org.gnome.desktop.lockdown gsettings, etc). Unfortunately, most of
these settings are ignored in Unity (I have filed separate bugs about
those).
Obviously, there are workarounds, including stealing all the other
VTs, or playing stupid D-Bus games, or wrapping X. Currently, our
preferred ("preferred") solution is to have our custom greeter check
logind and refuse to do anything other than unlock the existing
session if a user is already logged in on an X seat, but that's not
ideal, because you still end up with a second greeter running, and in
fact that becomes the primary greeter when the original user logs out.
That having been said, I believe it is the system administrator's
prerogative to dictate that there shall be one and only one seat
available on any given workstation, and instruct LightDM not to spawn
any additional ones. It would be great if this was added in future
releases. Alternatively, if that's not possible because of Unity
design, it would be great if there was a way for a greeter to say to
lightdm "I'm done, this seat is shutting down, switch back to an
original session." (And obviously, doing that if there is no other
session to switch to would be an error).
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