As requested, booted using battery power with setting "auto" in
/lib/udev/rules.d/99-laptop-mode.rules. Then changed setting back to
"force" and plugged in an external USB HDD (Transcend StoreJet).
The USB device seemed to be mounted successfully and I could write to
it.
Dmesg output attached.
Works for me too with Ubuntu 17.10 on an Acer Extensa laptop (i5-6200U
SkyLake). Same symptoms but changing 'force' to 'auto' as above results
in successful booting from battery.
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