I can’t find an active thinkpad centric community on here I am just going to post here. My Thinkpad T480s, 16 GB RAM, 238 GB SSD is randomly shutting off while at like 50%. When I try to open it back up it always is dead and I have to connect charger to boot it up again. Why is this happening? Is it battery issue? It complains about not being able to read temp2_input while shutting down and sometimes say PM usage count underflow. Not sure what that is supposed to mean.
When you say you need to connect the charger to get it to boot up again, do you mean boot to Linux or even to just show the BIOS? If the former, it might be that the battery level isn’t being read correctly by the OS, but if it’s the latter, the battery or its related circuitry is likely failing and you’ll need a replacement battery.
I dosen’t show BIOS no signs of life until charger is plugged in.
In that case, I don’t think the problem is with Arch. The battery is likely shot, as going from partly charged -> dead that quickly is a very common symptom of one that’s reached the end of its life.