OK, further investigation:
I booted with init=/bin/bash and ran rcS scripts until the problem
showed up.
S10udev was where the problem began.
** Changed in: gnome-power-manager (Ubuntu)
Status: Incomplete => Invalid
** Also affects: udev (Ubuntu)
Importance: Undecided
Status: New
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LCD brightness icon displayed incorrectly
https://bugs.launchpad.net/bugs/93913
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