How to implement power save mode in WiFi Adhoc

[NoOp]

On 05/12/2011 03:25 AM, jorge miguel gallo wrote:
> 
> Hello all,
> 
> I am having problems when trying to set power saving modes in a Wifi
> Adhoc network.
> 
> The 802.11 standard says that in order to save power stations can
> sleep and wake up every beacon interval in order to check if there is
> information for them and if not they will go back to sleep mode.
> 
> 
> 
> Since both, beacon interval and timeout, are parameters of iwconfig I
> thought I could change them. But when trying to set these parameters
> it says: :~$ sudo iwconfig wlan0 power period 2
> 
> Error for wireless request "Set Power Management" (8B2C) :
> 
> SET failed on device wlan0 ; Invalid argument.
> 
> 
> iw command doesn't work either.
> 
> I use Ubuntu 10.10 - Maverick Meerkat  with an Intel 3945ABG wireless
> card and iwl3945 driver.
> 
> 
> 
> Can anybody give me a tip?
> 
> Jorge.

Googling[1] suggests that powersave has been disabled. However, I did
find this:

<http://www.thinkwiki.org/wiki/How_to_reduce_power_consumption#intel_wireless>

<quote>
In recent kernels, the powersaving on the intel ipw3945 has been
disabled, as for some it is unstable. For others it worked just fine.

See this patch. You may wish to try changing '.broken_powersave=true' to
false, in /usr/src/linux/drivers/net/wireless/iwlwifi/iwl-3945.c if you
wish to enable powersave.

See also, to activate power saving on the wireless network card:

    For Intel PRO/Wireless 2200BG Mini-PCI Adapter and Intel
PRO/Wireless 2915ABG Mini-PCI Adapter, see instructions for the ipw2200
driver.
    For Intel PRO/Wireless 3945ABG Mini-PCI Express Adapter, see the
ipw3945 driver README
</quote>


<http://www.google.com/search?q=%22Error+for+wireless+request+%22Set+Power+Management%22+%288B2C%29+%3A%22&btnG=Search>
<http://www.google.com/search?q=iwl3945+%2Bpowersave&btnG=Search>