Public bug reported:

OS: 10.04.04
xorg: 7.5+5ubuntu1.1

Every reboot exhibits the same behavior: name and PW are accepted, but
the session terminates during the welcome sound, and goes back to the
login window.  A second attempt almost always succeeds, and logins are
normal until the next reboot.  This laptop has been in service for a
couple of years, running 10.04 LTS with updates (currently 10.04.04)
throughout, and this problem only started a few months ago.

I have captured some files with a console login.   I put some logs in 
pastebin.com (they don't tell me much, I hope they help you)
Xorg.0.log is at http://pastebin.com/38syicdp
Xorg.0.log.old is at http://pastebin.com/NgxzkSia

.xsession-errors is full of applications saying the X server died.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1.1
ProcVersionSignature: Ubuntu 2.6.32-40.87-generic 2.6.32.57+drm33.23
Uname: Linux 2.6.32-40-generic i686
Architecture: i386
Date: Sun Mar 25 19:48:19 2012
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release i386 (20100816.1)
MachineType: Gateway NV55C
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-40-generic 
root=UUID=67f4b776-fe59-4e80-b70f-1d5c85d52872 ro quiet splash
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: xorg
dmi.bios.date: 08/11/2010
dmi.bios.vendor: Gateway
dmi.bios.version: V1.04
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: NV55C
dmi.board.vendor: Gateway
dmi.board.version: V1.04
dmi.chassis.type: 10
dmi.chassis.vendor: Gateway
dmi.chassis.version: V1.04
dmi.modalias: 
dmi:bvnGateway:bvrV1.04:bd08/11/2010:svnGateway:pnNV55C:pvrV1.04:rvnGateway:rnNV55C:rvrV1.04:cvnGateway:ct10:cvrV1.04:
dmi.product.name: NV55C
dmi.product.version: V1.04
dmi.sys.vendor: Gateway
system:
 distro:             Ubuntu
 codename:           lucid
 architecture:       i686
 kernel:             2.6.32-40-generic

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


** Tags: apport-bug i386 lucid

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/964944

Title:
  GPU lockup during the first login after reboot

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