Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750991AbWKBRxl (ORCPT ); Thu, 2 Nov 2006 12:53:41 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751229AbWKBRxl (ORCPT ); Thu, 2 Nov 2006 12:53:41 -0500 Received: from mail.tmr.com ([64.65.253.246]:2200 "EHLO pixels.tmr.com") by vger.kernel.org with ESMTP id S1750991AbWKBRxk (ORCPT ); Thu, 2 Nov 2006 12:53:40 -0500 Message-ID: <454A306C.3050200@tmr.com> Date: Thu, 02 Nov 2006 12:52:44 -0500 From: Bill Davidsen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.7) Gecko/20060910 SeaMonkey/1.0.5 MIME-Version: 1.0 To: Jean Delvare CC: davidz@redhat.com, Richard Hughes , David Woodhouse , Dan Williams , linux-kernel@vger.kernel.org, devel@laptop.org, sfr@canb.auug.org.au, len.brown@intel.com, greg@kroah.com, benh@kernel.crashing.org, linux-thinkpad mailing list , Pavel Machek Subject: Re: [PATCH v2] Re: Battery class driver. References: <41840b750610310606t2b21d277k724f868cb296d17f@mail.gmail.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1787 Lines: 41 Jean Delvare wrote: > On 10/31/2006, man with no name wrote: >> In the case at hand we have mWh and mAh, which measure different >> physical quantities. You can't convert between them unless you have >> intimate knowledge of the battery's chemistry and condition, which we >> don't. > > You just need to know the voltage of the battery, what else? > >> And it would be nice to also allow for power supply devices that use >> other, incompatible units like "percent" or "minutes" or "hand crank >> revolutions". > > Do such batteries exist at the moment, or are you just speculating? I have seen joules (or mJ) on a laptop. Yes, it was Windows, but I bet the report came from hardware. Some vendor getting anal about metric? > I > don't quite see how a battery could report remaining energy in time > units, as power consumption varies over time. Hand crank revolutions > wouldn't be a very useful unit either, unless you know how much energy > a revolution provides, and then you can just convert it. Percent would > make some sense, but you can only express the remaining energy this way, > not the total. And if you know the total in mAh or mWh, you can multiply > by the percentage and you get the remaining energy in the same unit. > > -- > Jean Delvare -- Bill Davidsen Obscure bug of 2004: BASH BUFFER OVERFLOW - if bash is being run by a normal user and is setuid root, with the "vi" line edit mode selected, and the character set is "big5," an off-by-one errors occurs during wildcard (glob) expansion. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/