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[Launchpad Bug Tracker <557810@xxxxxxxxxxxxxxxxxx>]

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I have multiple user account on my netbook. One user (me, uid 1000)
logged in, using "change user" to change to an other account (uid 1001),
all ok. After using thunderbird and firefox user 1001 loggs off. Expect
the screen to switch to screen lock prompt for first user (uid 1000).

But Screen gets black and stays so. No screen change using alt-F1, crtl-
alt-F1, alt-F7, ctrl-alt-F7, alt/alt-ctrl-F8 or alt/alt-ctrl-F9
possible. System looks completely dead, but rebooting using alt-ctrl-del
still works, so doesn't sounds like a kernel lock-up to me, more like a
X mode change or screen change problem.

Will try to reproduce later. Writing this report after the first reboot,
so output of dmesg etc. is not useful.

Might be related to #419410?

ProblemType: KernelOops
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-19-generic 2.6.32-19.28
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
Uname: Linux 2.6.32-19-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.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  mmayer     1514 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf0400000 irq 22'
   Mixer name	: 'Realtek ALC269'
   Components	: 'HDA:10ec0269,144dc072,00100004'
   Controls      : 13
   Simple ctrls  : 8
Date: Thu Apr  8 10:45:21 2010
Failure: oops
HibernationDevice: RESUME=UUID=24eb35ae-5989-4674-a657-a7e4668068a9
InstallationMedia: Ubuntu-Netbook 10.04 "Lucid Lynx" - Beta i386 (20100318)
MachineType: SAMSUNG ELECTRONICS CO., LTD. N150/N210/N220
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-19-generic root=UUID=05c8f9a5-16f5-4838-8ca2-4f28f24552fd ro quiet splash
RelatedPackageVersions: linux-firmware 1.33
SourcePackage: linux
Title: WARNING: at /build/buildd/linux-2.6.32/lib/kref.c:43 kref_get+0x21/0x30()
dmi.bios.date: 01/29/2010
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 06JI.M053.20100129.JIP
dmi.board.asset.tag: SAMSUNG
dmi.board.name: N150/N210/N220
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr06JI.M053.20100129.JIP:bd01/29/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnN150/N210/N220:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnN150/N210/N220:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A:
dmi.product.name: N150/N210/N220
dmi.product.version: Not Applicable
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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


** Tags: apport-kerneloops i386 kernel-oops lucid needs-upstream-testing ubuntu-une
-- 
X system crash after user change
https://bugs.edge.launchpad.net/bugs/557810
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