This bug was fixed in the package lightdm - 1.5.2-0ubuntu1
---------------
lightdm (1.5.2-0ubuntu1) raring; urgency=low
* New upstream bugfix release:
* Fix stale X server being left behind when using LockSession D-Bus API
(LP: #1005813)
* Adjust AppArmor profile to also work with logind
* Don't use GIO to access X authority files - it uses GVFS which is
unnecessary overhead/complexity
* Handle over/underflows when reading from greeter
* Improve warning message when XDMCP packet has length mismatch
* Only report test command line if it fails
* Add more regression tests
-- Robert Ancell <[email protected]> Wed, 27 Mar 2013 14:44:44
+1300
** Changed in: lightdm (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1005813
Title:
Locking session leads to stale X server
Status in Light Display Manager:
Fix Released
Status in “lightdm” package in Ubuntu:
Fix Released
Bug description:
Choosing "Switch to different user" in Ubuntu gives you another login
screen, which is very nice and useful. However after using that
alternate session, lightdm keeps the X server and greeter for that
alternate session open and running. Gdm, on the contrary, terminates
the X server for the alternate session when you log out of it.
This behaviour does make a difference when you run Ubuntu on a laptop
on battery. Using the alternate login just once after boot (and ending
the session again) initiates a constant cpu load of 1-2% (on my
laptop). Doesn't sound much. But compared to "idle" without the second
X server and greeter, this is an increase of about 75%.
I admit that I didn't have the time to keep the laptop running idlely
und doing some real battery measurements. But with a laptop on
battery, you should use any possibility to save energy.
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