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I use a Lenovo Thinkpad T500 with Ubuntu 12.10 installed.

I have a strange problem. Often when I go to sleep at night and forget to plug my laptop in, I find in the morning that my laptop is completely dead. But other mornings it seems fine.

Checking the /var/log/pm-suspend.log I find that every time I close my laptop the log reports:

'Running hook /usr/lib/pm-utils/sleep.d/55NetworkManager suspend suspend: Having NetworkManager put all interaces to sleep...Failed '

I was wondering if its possible that my network interfaces not going to sleep may kill my laptops battery overnight if it is not completely charged?

If so, would it be better to switch my network card drivers or find an alternate suspend method?

Thank you for any help you can provide.

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