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a60fb26
(Get the code!)
I've just had the same problem on an Dell E6400 which is basically the same hardware so I post my additional info here:
I'm on Kubuntu 9.04:
uname -a
Linux lt2-tom 2.6.28-11-generic #36-Ubuntu SMP Fri Mar 20 19:51:24 UTC 2009x86_64 GNU/Linux
Usually sleep works just fine.
Unfortunately I haven't been able to reproduce the crash but here is what happened:
Watched some movies with VLC and changed power Profile from "Performance" to "Presentation".
Shut lid as usual but realized that under "Presentation" ubuntu doesn't go to sleep, it just switches of the screen.
Reopened lid, changed power profile back to performance and closed lid again.
Noticed that this time although the lid was closed the screen was still lit (light lit lit?), no sound as usual when sleep has been activated.
Waited about a minute and reopened the lid - Screen was lit but black, no message, no response to any keys so I did a hard reset.
Upon next boot I was greeted with the kernel error warning.
I hope this is helpful of any kind,
Thomas