Thanks to the new debug infrastructure (part of 1.52 release), it becomes very easy to now figure out what each individual module is doing.
The patch I proposed in previous mail was already part of wireless-ipw-power
module (ipw* is the wireless device that I use) but power saving never came
into effect. And I was lazy to figure out.
With the new debug help, I have now known the problem. Reliance on iwconfig is
going to work for the near future (till kernel breaks iwconfig).
The problem was the I wasn't gathering the exit code of iwconfig properly.
Fixed for 1.52. Works for ipw* devices. Will also work for iwl* devices.
PS: If you'd like to test, pm me. I can provide you a test deb.
Ritesh
On Saturday 19 Sep 2009 13:13:35 Ritesh Raj Sarraf wrote:
> Here's the final patch I've committed.
>
> === modified file 'usr/share/laptop-mode-tools/modules/wireless-iwl-power'
> --- usr/share/laptop-mode-tools/modules/wireless-iwl-power 2009-09-18
> 05:26:58 +0000
> +++ usr/share/laptop-mode-tools/modules/wireless-iwl-power 2009-09-19
> 07:41:49 +0000
> @@ -35,6 +35,16 @@
> else
> log "VERBOSE" "$DEVICE doesn't seem to be
> enabled. Radio Switched off?";
> fi
> + else
> + # LP: #369113
> + # Kernel's 2.6.29 and above have been reported to
> be missing
> + # the $DEVICE/wireless folder.
> + dev=`basename $DEVICE`
> + ret=`$IWCONFIG $dev >/dev/null 2>&1`;
> + if [ "$ret" = "0" ]; then
> + # add the interface name to the list
> + WIFI_IFNAMES="$WIFI_IFNAMES ${DEVICE##*/}"
> + fi
> fi
> done
> }
>
> On Saturday 19 Sep 2009 13:10:15 Ritesh Raj Sarraf wrote:
> > Hello Darren,
> >
> > On Saturday 19 Sep 2009 04:28:40 Darren Hoo wrote:
> > > > Again, on my box with ipw2200 device, 2.6.30 still presents the
> > > > wireless folder.
> > >
> > > with my 3945ABG card, 2.6.30 does not have this folder either.
> > > Isn't there a better way to check whether it is a wireless card?
> > >
> > > Also I want to know how does wireless card power saving work?
> > > I know that I can set the signal power of the card using iwconfig like
> > > # iwconfig wlan0 txpower 10
> > >
> > > but changing /sys/class/net/*/device/power_level does not change
> > > the tx-power that iwconfig reports.
> > >
> > > does this power_level have anything to do with that txpower?
> > > will reducing txpower by iwconfig help power saving at all?
> >
> > Following is what I had done for the wireless-ipw-power module
> >
> > # LP: #369113
> > # Kernel's 2.6.29 and above have been
> > reported to be missing
> > # the $DEVICE/wireless folder.
> > dev=`basename $DEVICE`
> > ret=`$IWCONFIG $dev >/dev/null 2>&1`;
> > if [ "$ret" = "0" ]; then
> > # add the interface name to the
> > list WIFI_IFNAMES="$WIFI_IFNAMES ${DEVICE##*/}"
> > fi
> >
> >
> > Perhaps, the same should be done for iwlwifi cards also. What we do here
> > is just run iwconfig on the device. If it is not a wireless device, it
> > would give you a bad exit status. That is what we are relying upon.
> >
> > I'll do the same for iwl-power module also.
> >
> > I'm not sure about the power saving. Wild guess is that if you know what
> > your workload is (eg. server with a wireless card), you can power tune
> > your device.
> >
> > Ritesh
>
--
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."
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