Public bug reported:

1)Log in
2)Switch to an other user account
3)Log off
->Black screen (not even Ctrl+Alt+F1 works)

ProblemType: KernelOops
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-21-generic 2.6.32-21.31
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.32-21.31-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Annotation: Your system might become unstable now and might need to be 
restarted.
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  kalmi      1427 F.... pulseaudio
 /dev/snd/controlC1:  kalmi      1427 F.... pulseaudio
CRDA: Error: [Errno 2] Nincs ilyen fájl vagy könyvtár
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfe978000 irq 16'
   Mixer name   : 'Realtek ALC888'
   Components   : 'HDA:10ec0888,14627379,00100001'
   Controls      : 36
   Simple ctrls  : 21
Card1.Amixer.info:
 Card hw:1 'camera'/'USB camera at usb-0000:00:1d.1-1, full speed'
   Mixer name   : 'USB Mixer'
   Components   : 'USB045e:00f7'
   Controls      : 3
   Simple ctrls  : 2
Date: Fri Apr 16 02:05:25 2010
Failure: oops
Frequency: Once every few days.
HibernationDevice: RESUME=UUID=7909eb86-17b5-4735-ac1b-f0b812a5c95f
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
IwConfig:
 lo        no wireless extensions.
 
 eth0      no wireless extensions.
MachineType: FUJITSU SIEMENS MS-7379VP
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-21-generic 
root=UUID=d90a6474-8fc6-4625-a900-d756978e8ba6 ro ipv6.disable=1 quiet splash
RelatedPackageVersions: linux-firmware 1.34
RfKill:
 
SourcePackage: linux
Title: WARNING: at /build/buildd/linux-2.6.32/lib/kref.c:43 kref_get+0x21/0x30()
dmi.bios.date: 07/02/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V9.0R
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: MS-7379VP
dmi.board.vendor: FUJITSU SIEMENS
dmi.board.version: 4.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: FUJITSU SIEMENS
dmi.chassis.version: 4.0
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrV9.0R:bd07/02/2008:svnFUJITSUSIEMENS:pnMS-7379VP:pvr4.0:rvnFUJITSUSIEMENS:rnMS-7379VP:rvr4.0:cvnFUJITSUSIEMENS:ct3:cvr4.0:
dmi.product.name: MS-7379VP
dmi.product.version: 4.0
dmi.sys.vendor: FUJITSU SIEMENS

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-kerneloops graphics i386 kernel-oops lucid 
needs-upstream-testing regression-potential

-- 
[i915]Fast switching to an other user account and then logging off causes black 
screen (not even Ctrl+Alt+F1 works)
https://bugs.launchpad.net/bugs/564326
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