[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 #9 from rkoberman at gmail.com ---
I'm using it on my T520 and it is working fine.

I read the old IBM whitepaper on this and they recommend keeping hte btter at
or below 85% when a ystm is usually plugged in. Not sure just what they
implemented, but the paper proposed that the percentage of time on battery be
tracked and if the battery percentage was below a threshold, the maximum charge
be reduced to 85%. If the charge dropped below come low value (20%?), the
maximum charge would reset to 100% for some time. Statistics were to be
retained across boots.

It's at least 20 years, so my memory of details is fuzzy, but I'm thinking of
writing something to implement at least a bit of this scheme, but I have done
little coding since kernels and drivers were written in assembly, so I'm hardly
the ideal person for the job.

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