[Bug 234403] [acpi_ibm] Support ThinkPad battery charge start/stop control

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234403

--- Comment #6 from Kevin Zheng <kevinz5000 at gmail.com> ---
(In reply to Manuel Stühn from comment #5)
Set those sysctls to a non-zero number between 0-100.

If you start with a full battery, set start_thresh to something like 80;
discharge your battery to 85%, plug in, battery shouldn't charge. Discharge to
75%, battery will charge until stop_thresh.

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