Date: Mon, 15 Mar 2010 22:20:26 +0100 From: Joerg Wunsch <j@uriah.heep.sax.de> To: freebsd-acpi@freebsd.org Subject: Re: Funny battery values (nx6325) Message-ID: <20100315212026.GH52442@uriah.heep.sax.de> In-Reply-To: <7d6fde3d1003151400t7af423e9h3a5af79f7c77e293@mail.gmail.com> References: <20100315062028.GC52442@uriah.heep.sax.de> <4B9E912E.4000409@root.org> <20100315201216.GF52442@uriah.heep.sax.de> <7d6fde3d1003151400t7af423e9h3a5af79f7c77e293@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
As Garrett Cooper wrote: > > I think the 2 A are realistic. With a 5100 mAh capacity, it should > > result in somewhat more than 2 hours of run time (maybe more if the > > laptop eventually goes idle, and reduces CPU speed). > If you were pulling 2 A, that's be the same approximate amount as > many 2 x 1U servers. Remember, this is measured at 10.8 V (or whatever the actual value is) battery voltage... The laptop is running on batteries here, how should it be able to measure the mains voltage/current? (Despite, the mains part of the supply is completely decoupled by the PSU.) This is what I'm getting on an old TP600E machine: dhcp208# acpiconf -i 0 Design capacity: 34560 mWh Last full capacity: 14080 mWh Technology: secondary (rechargeable) Design voltage: 10800 mV Capacity (warn): 1728 mWh Capacity (low): 345 mWh Low/warn granularity: 1 mWh Warn/full granularity: 1 mWh Model number: ThinkPad Battery Serial number: Type: LION OEM info: IBM Corporation State: discharging Remaining capacity: 99% Remaining time: 1:18 Present rate: 10641 mW Voltage: 11850 mV 10.6 W / 11.85 V = 0.9 A (the machine was idle here) No idea why the Thinkpad is returning Watts instead of Amperes, as most other ACPI BIOSes do. -- cheers, J"org .-.-. --... ...-- -.. . DL8DTL http://www.sax.de/~joerg/ NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20100315212026.GH52442>