Re: [Gumstix-users] Power Management on Gumstix+wifistix

[Eugene G. <egr...@ya...>]

Hi Shameer,

Can you share the power numbers you are getting:

full on
full standby (with wlan in suspend)
standby w/ wlan active

We are also looking into power management of the gumstix.  Right now we plan to wake up on an external interrupt.  Also, we used a command posted here a while ago to put wlan into low-power mode and that cuts down the current by 100 mA.  However, the wlan looses lock (permanently) with some of the wireless routers we tried.  Other routers work just fine.

Thanks!



----- Original Message ----
From: shami2008 <sha...@go...>
To: gum...@li...
Sent: Friday, June 26, 2009 7:51:28 AM
Subject: [Gumstix-users] Power Management on Gumstix+wifistix


Hi,

I am trying to get the power modes(standby & sleep) working on a gumstix
verdex platform.

The system run linux 2.6.21 version of kernel. After backporting the RTC
wake up code into the pxa27x.c file, the standby mode is working fine. The
system goes into standby(echo standby >/sys/power/state) and wakes up as per
the RTC Alrm setting timings.

But when I connect a wifistix board on top of gumstix, the system goes into
standby but never wake up compeletely. By observing the 'power' consumed by
the system, I can see that the system starts the waking up process after RTC
Alrm triggers but hangs/freezes in between.

When I removed the wlan drivers(mcf25 & cfio), it works fine. I have gone
thru the wlan driver code, and it puts the system into deepsleep mode when
the suspend interface is called. When I comment out this and just return
success from 'suspend' interface fn, everything works fine. But the power
consumption is more when the wifistix is not in sleep mode.

Anybody experienced a similar problem/or successful in putting the
gumstix+wifistix combo into standby mode, please advice.

Thanks,
Shameer 
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