(I didn't get your reply on mail, so I am replying this way)

>> I am using CoreBoot with SeaBIOS as a payload for ThinkPad T430s to boot
>> FreeBSD (but with Linux problem is same).
>> DSDT provided by CoreBoot is missing battery charge start (BCTG, BCCS) and
>> stop (BCSG, BCSS) thresholds.
>
> https://review.coreboot.org/c/coreboot/+/23178 (needs a rebase)
> implements the things you are asking for.

Nice :)

It is not merged, so cherry pick needs to be used, but anyway, great that is already in review. Also, when seeing patchset, it is definitively over my ACPI skillset.

> Just wondering is this a
> mainline driver in FreeBSD? Linux got one quite recently.

It is not yet merged but I suppose it will be soon:

Tested and it works :)

% sysctl dev.acpi_ibm.0.bat0_charge_{start,stop}
dev.acpi_ibm.0.bat0_charge_start: 20
dev.acpi_ibm.0.bat0_charge_stop: 81

Thank you all for great work!

Additional question (still related to ThinkPad EC):

- is it possible to make some sound/tone when battery is at critical charge and/or charger is disconnected?

There is "low_battery_beep" and "power_management_beeps" but I didn't manage to get it working on T430s