You have been subscribed to a public bug:
With up to date vivid, when I choose "Log out" from the KDE menu, the
log out process hangs and does not bring back the log in screen.
I am left with either a black screen (where the cursor can still move),
or if some non-KDE programs were running when I issued the log out
command, they may still be running.
Looking at the process list, I can see that sddm-helper has a couple of
zombie childs. If I do `sudo killall sddm-helper`, the log in process
completes and I can log in again.
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: sddm 0.11.0-0ubuntu3
ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
Uname: Linux 3.16.0-28-generic x86_64
ApportVersion: 2.15.1-0ubuntu1
Architecture: amd64
CurrentDesktop: KDE
Date: Fri Jan 2 21:57:24 2015
InstallationDate: Installed on 2015-01-01 (1 days ago)
InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20141230)
SourcePackage: sddm
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gnome-keyring (Ubuntu)
Importance: Critical
Status: Fix Released
** Tags: amd64 apport-bug asked-to-upstream iso-testing kubuntu vivid
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Can't log out from Plasma session with SDDM
https://bugs.launchpad.net/bugs/1407152
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Packages, which is subscribed to gnome-keyring in Ubuntu.
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