** Description changed:
- Unable to unlock Xubuntu XFCE session after suspend. I'm presented with
- unlock screen, and entering credentials will redirect to a black screen
- with "This session is locked", and "you will be redirected to unlock
- screen".
+ [Impact]
+ Due to a logic bug LightDM returning to an existing session from a greeter
can be unreliable. This case is common in systems which use the greeter as a
lock screen.
+
+ The bug was introduced in revision 1954 to fix bug 1296276. The race
+ condition seems to have been made more likely to the change in revision
+ 2437 to fix bug 1637758.
+
+ [Test Case]
+ 1. Log into a session
+ 2. Switch to the greeter (e.g. dm-tool switch-to-greeter)
+ 3. Log in again
+
+ Expected result
+ Returned to existing session
+
+ Observed result
+ Not always returned, can end up on blank screen.
+
+ [Regression Potential]
+ Low, the fix is to correct a logic bug that made LightDM think it hadn't
stopped a session correctly.
** Changed in: lightdm/1.20
Status: New => Fix Committed
** Changed in: lightdm/1.18
Importance: Undecided => High
** Changed in: lightdm/1.18
Status: New => Fix Committed
** Changed in: lightdm/1.10
Importance: Undecided => High
** Changed in: lightdm/1.10
Status: New => Fix Committed
** Description changed:
[Impact]
Due to a logic bug LightDM returning to an existing session from a greeter
can be unreliable. This case is common in systems which use the greeter as a
lock screen.
The bug was introduced in revision 1954 to fix bug 1296276. The race
condition seems to have been made more likely to the change in revision
2437 to fix bug 1637758.
[Test Case]
1. Log into a session
2. Switch to the greeter (e.g. dm-tool switch-to-greeter)
3. Log in again
Expected result
Returned to existing session
Observed result
- Not always returned, can end up on blank screen.
+ Not always returned, can end up on blank screen. Since this is a race
condition this may not occur on some systems.
[Regression Potential]
Low, the fix is to correct a logic bug that made LightDM think it hadn't
stopped a session correctly.
** Changed in: lightdm/1.20
Importance: Undecided => High
** Changed in: lightdm/1.10
Milestone: None => 1.10.7
** Changed in: lightdm/1.18
Milestone: None => 1.18.4
** Changed in: lightdm/1.20
Milestone: None => 1.20.1
** Changed in: lightdm
Importance: Undecided => High
** Changed in: lightdm
Status: New => Fix Committed
** Changed in: lightdm
Milestone: None => 1.21.5
** No longer affects: light-locker (Ubuntu)
** No longer affects: light-locker (Ubuntu Trusty)
** No longer affects: light-locker (Ubuntu Yakkety)
** No longer affects: light-locker (Ubuntu Xenial)
** Changed in: lightdm
Assignee: (unassigned) => Robert Ancell (robert-ancell)
** Changed in: lightdm/1.10
Assignee: (unassigned) => Robert Ancell (robert-ancell)
** Changed in: lightdm/1.18
Assignee: (unassigned) => Robert Ancell (robert-ancell)
** Changed in: lightdm/1.20
Assignee: (unassigned) => Robert Ancell (robert-ancell)
** Changed in: lightdm (Ubuntu Trusty)
Status: New => Triaged
** Changed in: lightdm (Ubuntu Xenial)
Status: New => Triaged
** Changed in: lightdm (Ubuntu Yakkety)
Status: New => Triaged
** Changed in: lightdm (Ubuntu Trusty)
Importance: Undecided => Medium
** Changed in: lightdm (Ubuntu Yakkety)
Importance: Undecided => Medium
** Changed in: lightdm (Ubuntu Xenial)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1656399
Title:
Returning to existing session is unreliable and can leave on blank
screen
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