Re: PCMCIA Power management

Could some or all of you that were involved in this thread submit info to the
supported hardware part of the wiki.

There is currently no wireless solutions listed there.

Thanks.

On Friday 20 July 2001 11:22, James ''Wez'' Weatherall wrote:
> --
>
> On Thu, Jul 19, 2001 at 04:26:49PM +0100, Will Stephenson wrote:
> > On Thursday 19 July 2001 2:48 pm, James ''Wez'' Weatherall wrote:
> > > Does anyone know how difficult it is to put a WaveLAN card into sleep
>
> mode
>
> > > from user space?
> > >
> > > Obviously, I could just use "cardctl eject" to do it, but that's rather
> > > heavyweight when all I really want to do is switch the card off for a
>
> short
>
> > > period to save power, without tearing down DHCP and so on.
> >
> > I'm experimenting myself, but do you think the various 'iwconfig eth0
> > power....' options might be useful here?
>
> Hmm, interesting. It seems the version of iwconfig on my ipaq is different
> than on my laptop, since the manpage on my laptop gives a power option that
> is not recognized (timeout) or, perhaps, not supported by the card.
> However, using:
>
> iwconfig eth0 power on
>
> Has some affect. On a relatively busy wireless network (university
> office/clasroom building) I get a barely visible, flickering power led,
> but the network stays up, and functional. When I browse slashdot.org
> with dillo, for example, the light comes on solid while loading.
>
> I'll try it in the other building, where there's a lot less wireless
> traffic. I'm guessing it'll go to sleep, and stay that way.
>
> Sounds like what James is looking for, perhaps?
> --
>
> Looking at this, it works rather well. Much better than under CE at any
> rate. The LED will never go completely off - if it did that then no-one
> would ever be able to transmit to it! :)
>
> I was really looking for some sort of low-latency on/off API, so that I can
> run my own low power protocol stack, but the in-built stuff looks very
> promising.
>
> Cheers!
>
> ---
> James "Wez" Weatherall
> "The path to enlightenment is /usr/bin/enlightenment"
> Laboratory for Communications Engineering, Cambridge - Tel : 766513
> AT&T Labs Cambridge, UK - Tel : 343000
>
>
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-- 
Joseph J. McCarthy, Assistant Professor
Department of Chemical and Petroleum Engineering
University of Pittsburgh
1249 Benedum Hall Pittsburgh, Pennsylvania 15261
Ph. 412-624-7362
Fax 412-624-9639
mccarthy_at_engrng.pitt.edu
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