On further testing, this looks like a hardware failure; the timing with
the kernel upgrade is probably coincidence. Booting to an older kernel
does not fix the problem, and charge detection works as expected when
using the dock connector.
(Turns out the laptop was also not *charging* when plugged in and
powered on, but would charge when plugged in and powered off. Weird, but
probably not software's fault?)
** Changed in: linux-lts-utopic (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1446312
Title:
On Thinkpad T431s, plugged-in AC adapter not detected
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