After installing 10.04, gdm just constantly restarts

Using an intel chipset. Worked fine in 9.10. After upgrading to 10.04, can't boot normally.

The splash screen comes up as normal. Then the screen blanks and an arrow cursor appears, with the sound that gdm normally makes. Instead of seeing the login dialog, the screen changes to a different black, then comes back, the sound is heard again, and this part repeats indefinitely.

Ctrl-Alt-F1 doesn't seem to help, nor Ctrl-Alt-Backspace. Hitting Ctrl-Alt-Delete at the right time (in between flashes) might make the machine reboot.

Changing the boot grub parameters to remove "quiet splash" and add "single" makes it so that I can login non-graphically. A "startx" is then successful, and normal operations can continue.

Can't figure out how to get gdm to start up properly.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-24-generic 2.6.32-24.41
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.32-24.41-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: genevieve 1168 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'I82801DBICH4'/'Intel 82801DB-ICH4 with ALC658D at irq 17'
   Mixer name : 'Realtek ALC658D'
   Components : 'AC97a:414c4781'
   Controls : 38
   Simple ctrls : 24
Date: Wed Aug 25 19:45:53 2010
HibernationDevice: RESUME=UUID=3ecbe468-1072-4859-9863-0c71dcc7d310
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
Lsusb:
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Compaq Presario 061 PC129A-ABA SR1110NX NA430
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-24-generic root=UUID=0c40c21a-0a49-42a0-994d-29b32a1a10b4 ro single
ProcEnviron:
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.34.1
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
dmi.bios.date: 05/17/2004
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: 3.11
dmi.board.name: Gamila/Giovani/Neon series
dmi.board.vendor: MICRO-STAR INTERNATIONAL CO., LTD
dmi.board.version: 030
dmi.chassis.type: 3
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr3.11:bd05/17/2004:svnCompaqPresario061:pnPC129A-ABASR1110NXNA430:pvr0n41411RE101GIOVA10:rvnMICRO-STARINTERNATIONALCO.,LTD:rnGamila/Giovani/Neonseries:rvr030:cvn:ct3:cvr:
dmi.product.name: PC129A-ABA SR1110NX NA430
dmi.product.version: 0n41411RE101GIOVA10
dmi.sys.vendor: Compaq Presario 061