Date: Tue, 3 Jul 2012 23:51:33 +1000 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: Erich Dollansky <erichfreebsdlist@ovitrap.com> Cc: freebsd-acpi@freebsd.org, Natacha =?iso-8859-1?q?Port=E9?= <natbsd@instinctive.eu> Subject: Re: How can I help with thinkpad x220 issues? Message-ID: <20120703231540.I46641@sola.nimnet.asn.au> In-Reply-To: <201207031820.22657.erichfreebsdlist@ovitrap.com> References: <20120523151357.GC97037@sigil.instinctive.eu> <201206300921.41695.erichfreebsdlist@ovitrap.com> <20120703083436.GD39287@sigil.instinctive.eu> <201207031820.22657.erichfreebsdlist@ovitrap.com>
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On Tue, 3 Jul 2012 18:20:22 +0700, Erich Dollansky wrote:
> On Tuesday, July 03, 2012 03:34:36 PM Natacha Porté wrote:
[..]
> > > How did you get this value? No battery inserted? The range should be
> > > from 0 to 100.
> >
> > Indeed, I had no battery inserted. Years ago I took the habit of
> > removing the battery of laptops used for long amount of time on AC
> > (currently for my X220, that's 9h every workday), because keeping a
> > fully charged battery on AC used to kill it. However I admit I don't
> > know whether technology improved enough to mnake it a non-issue (or even
> > whether even by then it was actually an issue and not an urban legend).
>
> As an engineer I would say that Lenovo would have done a real bad job
> if this makes still a significant difference.
Nonetheless, it's worth discharging and recharging both NiMH and Li-ion
batteries periodically. If you do it once a week that's only 52 cycles
per year; a small fraction of its design cycles, and unless you store it
partially charged in a fridge, less usage than its 'shelf life' anyway.
Apart from not harming the battery - which is designed for daily cycling
over 2 or 3 years - running it down past exhaustion now and again will
recalibrate the battery's onboard coulomb counter to reflect capacity.
At least when they were called IBMs, that was IBM's advice for Li-ion.
[..]
> > > > hw.acpi.battery.time: -1
> > > > hw.acpi.battery.state: 7
> > >
> > > I have 0 here.
> >
> > I have 2 when it's charging, and 1 when it's discharging.
>
> Ok, now I have the same. 1 and 2. But never 7. It seems that there
> are some secrets.
No secrets in FreeBSD, just stuff you have to hunt for and figure out :)
/usr/src/usr.sbin/acpi/acpiconf/acpiconf.c suggests hunting thus:
smithi on t23% find /sys/ -exec grep -H ACPI_BATT_ {} \;
[.. see usage in acpi_battery.c, acpi_{cm,sm}bat.c and acpi_machdep.c ..]
/sys/dev/acpica/acpiio.h:#define ACPI_BATT_STAT_DISCHARG 0x0001
/sys/dev/acpica/acpiio.h:#define ACPI_BATT_STAT_CHARGING 0x0002
/sys/dev/acpica/acpiio.h:#define ACPI_BATT_STAT_CRITICAL 0x0004
/sys/dev/acpica/acpiio.h:#define ACPI_BATT_STAT_NOT_PRESENT 0x0007
/sys/dev/acpica/acpiio.h:#define ACPI_BATT_STAT_MAX 0x0007
/sys/dev/acpica/acpiio.h:#define ACPI_BATT_UNKNOWN 0xffffffff /* _BST or _BIF value unknown. */
So 7 is no battery, 1 and 2 are discharging and charging, 5 and 6 are
critical discharging and critical charging (you'll see these shown by
acpiconf -i0 when the battery is very low) and 0 is fully charged.
[..]
> > > > $ sysctl dev.acpi_ibm
> > >
> > > I do not have anything with IBM or Lenovo.
Is this a Thinkpad model that shows no benefits from loading acpi_ibm?
cheers, Ian
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