[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 #11 from Kevin Zheng <kevinz5000 at gmail.com> ---
(In reply to rkoberman from comment #10)
Thanks for the comments.

The range is actually 0-99, where 0 means "battery controller default", and
1-99 is a custom setting.

The values are sticky, but they are not stored in the BIOS configuration. I
believe the values are actually persisted on the battery controller chip in the
battery pack and are reset when the battery pack is detached. Notice that if
you set a value, shut down the computer, remove and reattach the battery, the
values get reset.

I agree; it'd be great to figure out how to get this working on newer
ThinkPads. Until I get one, however, I have no incentive to write a patch :)

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