Computer often freezes while entering hibernation since maverick alpha

Since trying out Maverick Alpha, my Thinkpad T41 quite often (approx. 5 out of 10 times) freezes while entering hibernation mode. It always happens at the same stage. When hibernating successfully, this happens:

1. session gets locked, screen black, backlight on
2. VT appears, "moon" LED starts blinking
3. Backlight is turned off, "moon" LED blinks
4. Backlight is turned on again, "moon" LED off, HD saves memory contents
5. Computer turns off.

When the bug hits, computer hangs at step 3. (I once waited for some 15 minutes, nothing else happened.)

/var/log/pm-suspend.log always ends with lines like these:
Tue Aug 24 20:46:55 CEST 2010: performing hibernate

I turned on pm_trace; the hw clock is set but after booting, there is *never* a "hash matches" entry in dmesg output.

I tested several mainline kernels (last is 2.6.36-999.201008190908), all show the same behaviour.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-17-generic 2.6.35-17.23
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-17.23-generic 2.6.35.2
Uname: Linux 2.6.35-17-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: chronoss 1898 F.... pulseaudio
CRDA:
 country DE:
  (2400 - 2483 @ 40), (N/A, 20)
  (5150 - 5250 @ 40), (N/A, 20), NO-OUTDOOR
  (5250 - 5350 @ 40), (N/A, 20), NO-OUTDOOR, DFS
  (5470 - 5725 @ 40), (N/A, 26), NO-OUTDOOR, DFS
Card0.Amixer.info:
 Card hw:0 'I82801DBICH4'/'Intel 82801DB-ICH4 with AD1981B at irq 5'
   Mixer name : 'Analog Devices AD1981B'
   Components : 'AC97a:41445374'
   Controls : 26
   Simple ctrls : 18
Card29.Amixer.info:
 Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 1RHT71WW-3.04'
   Mixer name : 'ThinkPad EC 1RHT71WW-3.04'
   Components : ''
   Controls : 2
   Simple ctrls : 1
Card29.Amixer.values:
 Simple mixer control 'Console',0
   Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
   Playback channels: Mono
   Limits: Playback 0 - 14
   Mono: Playback 3 [21%] [off]
Date: Tue Aug 24 20:53:24 2010
HibernationDevice: RESUME=UUID=ba5e9423-6d83-46d6-9a22-0b33ef96ebe3
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: IBM 2373A91
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-17-generic root=UUID=4d015652-6ae1-4e87-acc6-e8c43a344ba5 ro
ProcEnviron:
 LANGUAGE=en_GB:en_US:en
 PATH=(custom, no user)
 LANG=en_GB.utf8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.38
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
UserAsoundrc:
 # ALSA library configuration file

 # Include settings that are under the control of asoundconf(1).
 # (To disable these settings, comment out this line.)
 </home/chronoss/.asoundrc.asoundconf>
WpaSupplicantLog:

dmi.bios.date: 06/18/2007
dmi.bios.vendor: IBM
dmi.bios.version: 1RETDRWW (3.23 )
dmi.board.name: 2373A91
dmi.board.vendor: IBM
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: IBM
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnIBM:bvr1RETDRWW(3.23):bd06/18/2007:svnIBM:pn2373A91:pvrThinkPadT41:rvnIBM:rn2373A91:rvrNotAvailable:cvnIBM:ct10:cvrNotAvailable:
dmi.product.name: 2373A91
dmi.product.version: ThinkPad T41
dmi.sys.vendor: IBM