No backlight on resume from suspend (Lucid regression)

[tyknkd]

1) Suspend system (from menu or keyboard)
2) System suspends
3) Press power-button to resume
4) System appears to resume (power indicator lights up, hard drive spins up) but the screen backlight remains off.
5) Must power down system by holding power button.

This behavior began after upgrading pm-utils to 1.3.0-1ubuntu2. Previously, system would not suspend and only locked-screen as described in this bug: https://bugs.launchpad.net/ubuntu/+source/pm-utils/+bug/573938. Suspend and resume worked in Karmic.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-22-generic 2.6.32-22.33
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic x86_64
NonfreeKernelModules: fglrx
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: tyler 1448 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfc500000 irq 22'
   Mixer name : 'IDT 92HD73C1X5'
   Components : 'HDA:111d7675,102802be,00100103'
   Controls : 16
   Simple ctrls : 10
Card1.Amixer.info:
 Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfc010000 irq 17'
   Mixer name : 'ATI R6xx HDMI'
   Components : 'HDA:1002aa01,00aa0100,00100100'
   Controls : 4
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [off]
CheckboxSubmission: 6d679793ae6131806707260f2bd7a500
CheckboxSystem: d00f84de8a555815fa1c4660280da308
Date: Wed May 12 16:10:18 2010
HibernationDevice: RESUME=UUID=cc10a039-b236-45f3-8bef-f5fcfd2cfe90
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
MachineType: Dell Inc. Studio 1555
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-22-generic root=UUID=3ae246bd-4598-4d91-8f69-e20ab1bdead8 ro quiet splash
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.34
SourcePackage: linux
dmi.bios.date: 11/07/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A08
dmi.board.name: 0C234M
dmi.board.vendor: Dell Inc.
dmi.board.version: A08
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A08
dmi.modalias: dmi:bvnDellInc.:bvrA08:bd11/07/2009:svnDellInc.:pnStudio1555:pvrA08:rvnDellInc.:rn0C234M:rvrA08:cvnDellInc.:ct8:cvrA08:
dmi.product.name: Studio 1555
dmi.product.version: A08
dmi.sys.vendor: Dell Inc.