[coreboot] Battery thresholds on lenovo T400

ron minnich rminnich at gmail.com
Mon Dec 12 17:11:53 CET 2016

I think it would be interesting to have such functionality in userspace.

On Mon, Dec 12, 2016 at 8:04 AM Michal Widlok <michalwd1979 at gmail.com>

> Dear Members,
> I looking for a way to set battery charge thresholds on T400 with
> coreboot. I know that tp_smapi are not supported, but I found an
> interesting thread (it's for X220, but I hope that my would be
> similar):
> https://www.flashrom.org/pipermail/coreboot/2016-May/081460.html
> The post says:
> "tp smapi depends on lot of SMM/SMI code. So tp-smapi kernel module
> asked the Lenovo BIOS to tell the EC to do something. coreboot don't
> want to support SMM/SMI APIs, because they are quite dangerous.
> But there is another way to get those features back.
> We know how to enable it, but we haven't yet create a way to control
> this by the user.
> One thing could be a userspace tool executed as root or we add another
> CMOS configuration for it. Any idea?"
> Is that mean that EC in lenovo laptops is "known" enough to control
> it, but coreboot is not ready to implement this functionality? An if
> it is known the is there any literature/posts available that says how
> to control it with ectool or something?
> If there are any test needed to be done to help about this subject,
> then I can do them on my laptop. Hardware flashing is possible also.
> Very best regards,
> Michael Widlok
> --
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