When I try to switch user by the panel applet or new login in system tools or to use guest session, my screen gets dark and computer freezes. It happens also in Hardy for me. I found only this line in syslog:
Oct 29 13:47:55 DESKTOP-Linux acpid: client connected from 5435[0:0]
and this line in auth.log:
Oct 29 13:48:19 DESKTOP-Linux gnome-screensaver-dialog: gkr-pam: unlocked 'login' keyring
---
Architecture: amd64
DistroRelease: Ubuntu 10.04
DkmsStatus:
fglrx, 8.723.1, 2.6.32-21-generic, x86_64: installed
fglrx, 8.723.1, 2.6.32-22-generic, x86_64: installed
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
MachineType: MSI MS-7032
NonfreeKernelModules: fglrx
Package: fglrx-installer (not installed)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-22-generic root=UUID=ecde4285-c5e6-4033-9b5b-624678fa16dd ro quiet splash
ProcEnviron:
PATH=(custom, no user)
LANG=cs_CZ.utf8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
Tags: lucid lucid
Uname: Linux 2.6.32-22-generic x86_64
UserGroups:
dmi.bios.date: 07/28/2005
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080011
dmi.board.name: MS-7032
dmi.board.vendor: MSI
dmi.board.version: 1.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080011:bd07/28/2005:svnMSI:pnMS-7032:pvr1.0:rvnMSI:rnMS-7032:rvr1.0:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: MS-7032
dmi.product.version: 1.0
dmi.sys.vendor: MSI
system:
distro: Ubuntu
codename: lucid
architecture: x86_64
kernel: 2.6.32-22-generic
Can you reproduce the freeze?
Do you have compiz enable? If yes, can you reproduce it without compiz?
Can you look into kern.log to see if there is some important information such as segfaut.
I mark this report until we have more information.