Thinkpad T510, freezes on battery power

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https://bbs.archlinux.org – My Thinkpad T510 will freeze after anything from a few seconds to a few minutes after boot. I cannot do anything except hard power off the laptop. Sometimes it freezes at the login screen, sometimes at the desktop. So far it hasn't frozen on boot. I'm using Gnome 3 and GDM. Laptop-mode which is enabled on battery and AC power. I'm using the nvidia graphics card with proprietary drivers.I actually had a similar problem to this before, where it would freeze on battery power but much less often, usually anything from 10 minutes to hours after boot. It seemed like that problem had b (HowTos)