From owner-freebsd-questions@freebsd.org Fri May 17 07:05:32 2019 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 11B1215B13C1; Fri, 17 May 2019 07:05:32 +0000 (UTC) (envelope-from guru@unixarea.de) Received: from smh-06.1blu.de (smh-06.1blu.de [178.254.0.206]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id BF6D28D838; Fri, 17 May 2019 07:05:30 +0000 (UTC) (envelope-from guru@unixarea.de) Received: from [172.16.29.5] (helo=sh4-5.1blu.de) by smh-06.1blu.de with esmtp (Exim 4.86_2) (envelope-from ) id 1hRWvf-0002me-KF; Fri, 17 May 2019 09:05:19 +0200 Received: from ftp51246-2575596 by sh4-5.1blu.de with local (Exim 4.86_2) (envelope-from ) id 1hRWvf-00048m-A1; Fri, 17 May 2019 09:05:19 +0200 Date: Fri, 17 May 2019 09:05:19 +0200 From: Matthias Apitz To: freebsd-questions@freebsd.org Cc: freebsd-mobile@freebsd.org Subject: calibrating a laptop battery Message-ID: <20190517070519.GA9987@sh4-5.1blu.de> Reply-To: Matthias Apitz Mail-Followup-To: freebsd-questions@freebsd.org, freebsd-mobile@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit X-Operating-System: FreeBSD 12.0-CURRENT r314251 (amd64) X-message-flag: Mails containing HTML will not be read! Please send only plain text. User-Agent: Mutt/1.5.24 (2015-08-30) X-Rspamd-Queue-Id: BF6D28D838 X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-3.02 / 15.00]; ARC_NA(0.00)[]; HAS_REPLYTO(0.00)[guru@unixarea.de]; URIBL_BLOCKED(0.00)[unixarea.de.multi.uribl.com,acer.com.multi.uribl.com,battery.life.multi.uribl.com,ubuntu.com.multi.uribl.com]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; DMARC_NA(0.00)[unixarea.de]; AUTH_NA(1.00)[]; REPLYTO_EQ_FROM(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; IP_SCORE(-1.28)[ipnet: 178.254.0.0/19(-3.57), asn: 42730(-2.83), country: DE(-0.01)]; MX_GOOD(-0.01)[mail.unixarea.de]; RCPT_COUNT_TWO(0.00)[2]; NEURAL_HAM_SHORT(-0.64)[-0.638,0]; NEURAL_HAM_MEDIUM(-1.00)[-0.996,0]; R_SPF_NA(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:42730, ipnet:178.254.0.0/19, country:DE]; RCVD_TLS_LAST(0.00)[] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 17 May 2019 07:05:32 -0000 Hello, Background: I have an Acer C720 netbook (selled as a so called Chromebook, but running CURRENT fine) and after some year of usage (since 2015) I bought a new battery, original from Acer (as least claimed by the dealer as original). When the battery was installed, FreeBSD showed this with 'sysctl -n hw.acpi.battery.life' as 100% charged. I was told, I have to 'calibrate' it with the procedure: let it run out of energy without power supply, and charge it again to 100%. But magically it charges only up to 75% when the blue LED says "fully charged", and each day this point goes up 1% more, i.e. LED goes blue next day with 76%, the day after 77% and so on until somewhere around 96%. When I fully discharge it again (i.e. using it on the road until nearly power-off), this process starts again with 75%. I was told in a thread in the Acer forum https://community.acer.com/en/discussion/567420/acer-c720-battery-hassles a lot of things, even Windows hints (I saif FreeBSD) or a magic hole in the bottom of the case (which is not there in the Acer C720) and among others they pointed to an Ubuntu tool http://manpages.ubuntu.com/manpages/xenial/man8/power-calibrate.8.html Questions: 1) What does the word "calibrate battery" means technically? 2) Do we have something in FreeBSD to do 1) 3) Any other ideas about this issue? Thanks matthias -- Matthias Apitz, ✉ guru@unixarea.de, http://www.unixarea.de/ +49-176-38902045 Public GnuPG key: http://www.unixarea.de/key.pub May, 9: Спаси́бо освободители! Thank you very much, Russian liberators!