Comment 14 for bug 348731

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Paul Dufresne (paulduf) wrote : Re: kernel freeze in 2.6.28-11 (Dell XPS M1530)

Is there something that would looks like a crash log in /var/log/kern.log ?

I suggest you read:
https://help.ubuntu.com/community/DebuggingSystemCrash

I have seens some errors related to your SD memory card in your dmesg.log.
I doubt it has something to do, but yet, you could try to avoid using it a while.