Date: Tue, 3 Nov 2020 12:36:57 +0200 From: Stefan Parvu <sparvu@kronometrix.org> To: freebsd-arm@freebsd.org Subject: Re: RPI3B+ disable HDMI Message-ID: <050F146D-7A67-4143-97AC-5EFEAE502595@kronometrix.org> In-Reply-To: <20201101022257.GA18863@www.zefox.net> References: <842D1575-F21A-4656-B81C-08D828286B6C@kronometrix.org> <20201101022257.GA18863@www.zefox.net>
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Thank you all for answers. Will experiment with these.=20 At least we got a basic 12hrs run on a single charge, running = Kronometrix data recorders (1 recorder up), ethernet cable on. Stefan > On 1. Nov 2020, at 4.22, bob prohaska <fbsd@www.zefox.net> wrote: >=20 > On Sat, Oct 31, 2020 at 09:59:38PM +0200, Stefan Parvu wrote: >> Hi, >>=20 >> We have started now testing our product using FreeBSD 12.2 on RPI3 = and 3B+.=20 >>=20 >> I have a question how one can start to disable things from the board = which are not needed, to save as much as possible power. For example = starting with HDMI port. I am trying to do some basic tests running our = data recorders with FreeBSD 12.2 only on batteries. (4 x 18650 Li-ion = 3500 mAh). Would it boot from batteries. Has anyone tried before this? >=20 > At one time ISTR that no monitor in the HDMI port on powerup turned = off > the port, at least to the extent that if a monitor was subsequently = plugged > in it got no signal. Not sure if this is still true, nor whether it = actually > reduced power consumption.=20 >=20 > hth, >=20 > bob prohaska >=20
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