conserving power with hostap

[Ichiro Barnes]

Thanks for the suggestion. I did give it a try, but had problems with resuming:
 
---
noaodv-20:~# cardctl suspend 0
cardmgr[63]: executing: './network suspend wlan0'
noaodv-20:~# iwlist wlan0 scan
wlan0     Interface doesn't support scanning : No such device
noaodv-20:~# cardctl resume 0
wlan0: Interrupt, but SWSUPPORT0 does not match: FFFF != 8A32 - card removed?
wlan0: could not find matching txfid (0xf9f0, new read 0xf9f0) for alloc event
hostap_cs: wlan0: resetting card
hostap_cs: Initialization failed
wlan0: interrupt delivery does not seem to work
wlan0: interrupt delivery does not seem to work
wlan0: Port type setting to 1 failed
wlan0: MAC port 0 enabling failed
cardmgr[63]: executing: './network resume wlan0'
noaodv-20:~# iwlist wlan0 scan
wlan0     Interface doesn't support scanning : Invalid argument
---
 
Any ideas about what could be going on here?
 
Thanks in advance,
 
Itchy

Vijay Raghunathan <vijay at ee.ucla.edu> wrote:

Another way (ugly hack?) to do this is to simply use cardctl to shutdown
the interface. So, issuing a "cardctl suspend" should completely
shutdown the PCMCIA interface, which can be woken up using "cardctl
resume".

-Vijay

On Wed, 2003-11-12 at 13:42, Ichiro Barnes wrote:
> Hi,
> 
> I am writing a tool that wakes up every n seconds,
> does an iwlist wlan0 scan, and goes back to sleep. I
> don't need to connect to anything or look at any
> packets beyond what is needed for the scan. The device
> I'm using for this is highly power-constrained, so I'm
> trying to figure out how to extend its battery life.
> 
> I ran across this thread about turning the radio on
> and off:
> http://hostap.epitest.fi/hostap/2002-03/0300.html
> I've tried setting txpower to off in between scans,
> but to my surprise it hasn't helped much. So now I'm
> interested in trying to use the writemif ioctl for
> power management.
> 
> My problem is that the datasheet has been moved to
> some licensee-only server, so I don't know the right
> values to use for my writemif experiments. Can anyone
> tell me what I should use? Or if I should trying
> something else completely in my quest for longer
> battery life?
> 
> I'm using hostap 0.1.1, and a Netgear Ma701, firmware
> 1.4.9.
> 
> Thanks in advance,
> 
> -I
> 



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