[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 #4 from Kevin Zheng <kevinz5000 at gmail.com> ---
(In reply to rkoberman from comment #3)
Perhaps "Lenovo" is better than "ThinkPad" and "IBM". Note that this patch does
not change the name of the module, so it is still "acpi_ibm" and loading
"acpi_ibm" will still continue to work.

Controlling battery charge thresholds could be useful for prolonging battery
life in machines that are used mostly on AC power. On Windows, battery charging
thresholds can be controlled using the Lenovo Power Manager. This patch exposes
the same functionality through the sysctl interface.

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