Date: Tue, 13 Jan 2015 10:13:37 +0100 From: Lars Engels <lars.engels@0x20.net> To: Adrian Chadd <adrian@freebsd.org> Cc: Matthias Apitz <guru@unixarea.de>, "freebsd-mobile@freebsd.org" <freebsd-mobile@freebsd.org> Subject: Re: power off ath0: <Atheros AR946x/AR948x> Message-ID: <20150113091337.GL67556@e-new.0x20.net> In-Reply-To: <CAJ-Vmo=8xr7hQ9z1Fy_kmMv3nSxhc-zPFBQfw8WqaqB132XsfA@mail.gmail.com> References: <20150111080530.GA2035@c720-r276659> <54B3FC5F.3070306@FreeBSD.org> <87A73FD4-485B-4F38-B9D2-3F804BED4905@bsdimp.com> <CAJ-Vmo=8xr7hQ9z1Fy_kmMv3nSxhc-zPFBQfw8WqaqB132XsfA@mail.gmail.com>
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--VnOTrGv5LmZxna7m Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Jan 12, 2015 at 11:20:07AM -0800, Adrian Chadd wrote: > On 12 January 2015 at 08:56, Warner Losh <imp@bsdimp.com> wrote: > > > >> On Jan 12, 2015, at 9:54 AM, John Baldwin <jhb@FreeBSD.org> wrote: > >> > >> On 1/11/15 3:05 AM, Matthias Apitz wrote: > >>> > >>> Hello, > >>> > >>> Is there a way to completely power-off the Wifi chip in my Acer C720? > >>> I tried 'ifconfig ath0 down' which saves around 20 mA. But the LED st= ays > >>> on, which let me think it is still someow on-air. > >> > >> Not yet. You could try setting the tunable to disable power for PCI > >> devices without a driver and not include 'ath' in your kernel config. = I > >> will (soon) commit a new 'devctl' tool to HEAD that would let you do > >> 'devctl suspend ath0' to do this. > > > > I=E2=80=99d love to see this tied into the forthcoming work on PCIe hot= plug as well, > > which is one way to power off the slot. But that work seems to be stall= ed=E2=80=A6 >=20 > Right. So, the driver in -HEAD should be powering off almost all of > the chip when no vap (ie, wlanX) is active. The only parts of the chip > that stay on is the PCIe PHY and the GPIO/RTC block. AFAIK we don't > support PCIe power save state management at the moment, so we can't > keep the PCIe PHY off. >=20 > But yeah, most of the chip is off. The chip doesn't take all that much > power unless it's actively transmitting/receiving. The LEDs are on > because the GPIO block is on and it's likely holding the LED up. Is that only true for this chip, all ath ones or even all wireless devices? --VnOTrGv5LmZxna7m Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQF8BAEBCgBmBQJUtOHBXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQ4RjQwMDE3RTRERjUzMTI1N0FGRTUxNDlF NTRDQjM3RDNBMDg5RDZEAAoJEOVMs306CJ1t61EH/RI48mqgx6Ju7p1EmfXq1bB5 B1buZLDWvIwGJ5VUt874K8F9o3QphC8Yt69QlQAFqx0lkuRrGwAZMgTMlodmjruM PEf227BEC4tOM9LpKJmiFmFofKUWjO7y85sj3V6yfuFzfiPO/P+r+FiVYPfZUv+Y vzKdzTSY5ggmiukiy7Gx1TylbPOg/IirjX4CbSuTTFhlHXm8CHl6FbwFt9cMBVL0 E1aGUfoTp7gvdToPP5vp6FttFiyFuIJtVzI2DA6m+R2DaLEDcVpAfcczouNYBqW5 OecKvnxk0drGBGCMvg+7LL2Boh+1Aj3Cpxra/OlsMucDJa+OHKOS+WGbJRqcE/8= =N0cS -----END PGP SIGNATURE----- --VnOTrGv5LmZxna7m--
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