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[Chris <chris3@xxxxxxxxxx>]

Public bug reported:

Binary package hint: xserver-xorg-video-intel

I'm using multiple user on the same system. When I switch between the users it sometimes (not always) happens that the session of the user I want to switch back to crashes. 
Instead of beeing prompted for the password for the user I switched to the screen goes blank and comes back with the gdm screen where I can perform a fresh login for the user. The old session of the user is no longer existing. A log in with the user name starts a new session.

Syslog with gdm debug enabled shows:

Apr  6 22:17:37 MySystem gdm-binary[861]: DEBUG(+): GdmLocalDisplayFactory: Switching to session /org/freedesktop/ConsoleKit/Session2 (user chris)
Apr  6 22:17:38 MySystem acpid: client connected from 993[0:0]
Apr  6 22:17:38 MySystem acpid: 1 client rule loaded
Apr  6 22:17:38 MySystem kernel: [  340.225146] [drm:i915_gem_do_execbuffer] *ERROR* Object ef6a5120 appears more than once in object list
Apr  6 22:17:38 MySystem gdm-session-worker[1320]: DEBUG(+): GdmSessionWorker: child (pid:1398) done (status:1)
Apr  6 22:17:38 MySystem gdm-session-worker[1320]: DEBUG(+): GdmSessionWorker: Calling SessionExited
Apr  6 22:17:38 MySystem gdm-simple-slave[987]: DEBUG(+): session_message_handler: destination=(null) obj_path=/org/gnome/DisplayManager/Session interface=org.gnome.DisplayManager.Session method=SessionExited

I also enabled debugging for DRM via echo 1 | sudo tee /sys/module/drm/parameters/debug and reproduced the error
Logfile in Syslog_gdm_drm_debug
The logfile starts when I switch on debugging for DRM, then I switch to a second user (timo), when switching back to the original user (chris) the error occurs.

Im using Lucid Beta with latest updates.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
Uname: Linux 2.6.32-19-generic i686
Architecture: i386
Date: Sat Apr 10 20:31:33 2010
DkmsStatus: Error: [Errno 2] No such file or directory
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta i386 (20100318)
MachineType: FUJITSU SIEMENS AMILO Pi 2515
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.32-19-generic root=UUID=5415e021-0f11-43b6-81dc-78a37eff88ee ro quiet splash
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
Title: Xorg crash
dmi.bios.date: 06/24/2008
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 1.11C
dmi.board.name: F43
dmi.board.vendor: FUJITSU SIEMENS
dmi.chassis.type: 10
dmi.chassis.vendor: FUJITSU SIEMENS
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr1.11C:bd06/24/2008:svnFUJITSUSIEMENS:pnAMILOPi2515:pvr20:rvnFUJITSUSIEMENS:rnF43:rvr:cvnFUJITSUSIEMENS:ct10:cvr:
dmi.product.name: AMILO Pi 2515
dmi.product.version: 20
dmi.sys.vendor: FUJITSU SIEMENS
glxinfo: Error: [Errno 2] No such file or directory
system:
 distro:             Ubuntu
 codename:           lucid
 architecture:       i686
 kernel:             2.6.32-19-generic

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug crash i386 lucid

-- 
Xorg error when switching user - drm:i915_gem_do_execbuffer] *ERROR* Object ef6a5120 appears more than once in object list
https://bugs.launchpad.net/bugs/560197
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