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Trusty 14.04.4 Laptop powers off unexpectedly

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Recently upgraded the HWE to the Wily stack (Kernel 4.2) on my Thinkpad T410. Now, even when on AC, the laptop powers down for no reason. Originally I thought it was due to inactivity and suspected tlp, but there doesn't seem to be any settings for "power down when inactive." Also, this happened while I was actually using the laptop. This never happened on the 14.04.3 and Vivid stack.

I have a desktop system that is also running the same level of software and it remains active all the time. The desktop system does use a proprietary driver for the NIC, but is otherwise all open source like the laptop. I also run Apache, sftp and Steam on the desktop system but not on the laptop.

Any ideas on what I should be checking?

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