Date: Mon, 12 Jan 2015 11:20:07 -0800 From: Adrian Chadd <adrian@freebsd.org> To: Warner Losh <imp@bsdimp.com> Cc: Matthias Apitz <guru@unixarea.de>, "freebsd-mobile@freebsd.org" <freebsd-mobile@freebsd.org> Subject: Re: power off ath0: <Atheros AR946x/AR948x> Message-ID: <CAJ-Vmo=8xr7hQ9z1Fy_kmMv3nSxhc-zPFBQfw8WqaqB132XsfA@mail.gmail.com> In-Reply-To: <87A73FD4-485B-4F38-B9D2-3F804BED4905@bsdimp.com> References: <20150111080530.GA2035@c720-r276659> <54B3FC5F.3070306@FreeBSD.org> <87A73FD4-485B-4F38-B9D2-3F804BED4905@bsdimp.com>
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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 stay= s >>> 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 p= lug as well, > which is one way to power off the slot. But that work seems to be stalled= =E2=80=A6 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. 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. -adrian
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