linux-kernel - Re: [PATCH v2] thinkad_acpi: Support the battery wear control

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Date:   Tue, 5 Dec 2017 15:22:28 +0100
From:   Christoph Böhmwalder <christoph@...hmwalder.at>
To:     Ognjen Galic <smclt30p@...il.com>
Cc:     Jonathan Corbet <corbet@....net>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Henrique de Moraes Holschuh <ibm-acpi@....eng.br>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        ibm-acpi-devel@...ts.sourceforge.net
Subject: Re: [PATCH v2] thinkad_acpi: Support the battery wear control

On Sun, Dec 03, 2017 at 11:56:40PM +0100, Ognjen Galic wrote:
> Add support for the ACPI batteries on newer thinkpad models
> (>Sandy Bridge) that support the setting of start and stop
> thresholds.
> 
> The actual interface to the driver is a extension for the
> existing ACPI battery driver. This was done so that users
> can write transparently to the interface of the ACPI battery
> driver and dont have to use some private interface
> (for ex. /sys/devices/platform/thinkpad_acpi/).
> 
> Two new interfaces are created:
> 
> /sys/class/power_supply/BAT{0,1}/charge_start_threshold
> /sys/class/power_supply/BAT{0,1}/charge_stop_threshold

Just tried this on my X1 Carbon (i7-3667U Ivy Lake):

# cat /sys/class/power_supply/BAT0/charge_stop_threshold
100
# cat /sys/class/power_supply/BAT0/charge_start_threshold
100

That doesn't seem to make any sense.  Is my battery somehow reporting
false values here?  Any way to cross check these values?

--
Regards,
Christoph