Skip site navigation (1)Skip section navigation (2)
Date:      Sun, 30 Sep 2012 23:38:27 +1000 (EST)
From:      Ian Smith <smithi@nimnet.asn.au>
To:        =?windows-1251?B?y/7h7uzo8CDD8Ojj7vDu4g==?= <nm.knife@gmail.com>
Cc:        freebsd-mobile@freebsd.org
Subject:   Re: Turning off battery while on AC
Message-ID:  <20120930220701.I43208@sola.nimnet.asn.au>
In-Reply-To: <CAHi1Jscm5PcOf4_EXZkuvGKQfUn_efO7TK7YDTdO=nznTj6ARw@mail.gmail.com>
References:  <CAHi1Jscm5PcOf4_EXZkuvGKQfUn_efO7TK7YDTdO=nznTj6ARw@mail.gmail.com>

next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, 28 Sep 2012 13:01:02 -0700, nm.knife@gmail.com wrote:

 > Sorry if this has been answered, but is there a way to set a laptop (I have
 > ThinkPad X220) not to draw energy from the battery when it's on AC? In
 > Windows once the battery is not charging and you are on AC, the battery is
 > totally bypassed. You can imagine this being better than it constantly
 > charging and being used.
 > 
 > Is this something that is hardware built in, or is it controlled by the OS?
 > Is there an equivalent in FreeBSD? (or maybe GNU/Linux)?

What indicates that it's using energy from the battery while on AC?  
Please show:
 % acpiconf -i0
when the battery is fully charged and running on AC power?

Earlier Thinkpads (I have a couple of T23s) always fully charge the 
battery then disconnect it, letting it slowly self-discharge until the 
reported capacity drops to ~95%, over some days usually, when it gets 
boosted back to 100%  IBM were careful not to trickle-charge Li-Ion 
batteries, avoiding risk of fire or explosion - Lenovo too, I guess. 

If yours is not behaving like that, then acpiconf -i0 should show 
something happening on 'Present rate', which shows charge rate during 
charging, and discharge rate while running from battery.  When fully 
charged (State: high) running on AC, it should show 0mW (on some, mA):

smithi on t23% acpiconf -i0
Design capacity:        43200 mWh
Last full capacity:     31850 mWh
Technology:             secondary (rechargeable)
Design voltage:         10800 mV
Capacity (warn):        2160 mWh
Capacity (low):         432 mWh
Low/warn granularity:   1 mWh
Warn/full granularity:  1 mWh
Model number:           IBM-02K7026
Serial number:            932
Type:                   LION
OEM info:               Panasonic
State:                  high
Remaining capacity:     100%
Remaining time:         unknown
Present rate:           0 mW
Present voltage:        12381 mV

 > Lyubomir Grigorov (bgalakazam)

cheers, Ian



Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20120930220701.I43208>