Restart and shutdown always work, but when I try and just logout, it tends to hang with a blank screen and just the cursor. I have checked what processes are running from the console, but found nothing obvious that could be holding it up. The cursor that is shown is KDM's cursor, I know this because if you install the extra oxygen cursors KDM defaults to the black one and with my cursor set to the white one, it does make the switch to the black one when it hangs. On the occasion that it successfully brings up the KDM login screen, if you attempt to login it will go black after you enter your credentials and then re-display the KDM login screen. If you then re-enter your credentials, it will actually login. This occurs on 3 different computers I own, 2 laptops and 1 desktop. Two of the systems have AMD GPU's and are running the radeon driver, while the 3rd uses Intel graphics.
If there is any further information I can collect to help debug this or if this is actually an upstream KDE bug, I will be happy to submit any requested info.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: kde-full (not installed)
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Sat Oct 22 17:49:35 2011
EcryptfsInUse: Yes
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcEnviron:
LANGUAGE=
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: meta-kde
UpgradeStatus: No upgrade log present (probably fresh install)
Status changed to 'Confirmed' because the bug affects multiple users.