I just tried the image and was able to turn the power management on
and off using these commands:
$ iwconfig wlan0 power on => 0.47A with 4.3 display, bluetooth and a
$ iwconfig wlan0 power off => 0.63A as above
For some reason the 'power saving' version of the command didn't work for me.
On Mon, Apr 5, 2010 at 5:00 AM, Tuomas Kulve <tuomas@...> wrote:
> Steve Sakoman wrote:
>> On Sat, Apr 3, 2010 at 5:09 AM, Tuomas Kulve <tuomas@...> wrote:
>>> A 100 megabyte file transferred to /dev/null in 49.6 seconds which means
>>> about 2 megabytes/sec throughput.
>> So that is more than twice what I am seeing (7 Mbits vs 16 Mbits for
>> you). Not too surprising since I'm quite some distance from the
>> access point and have a low signal level.
> Yes, my gumstix is 40 cm away from the AP ;)
>>> The wireless chip cover is burning hot. Are there possibilities to
>>> adjust the WLAN/BT power consumption? I don't need BT, so I could
>>> disable that completely. What about audio chip, dsp, sgx, etc?
>> You might try to use the iwconfig utility. I believe it has options
>> for power level, though I don't know for certain that the libertas
>> driver will honor them.
> --- clip ---
> Additionally, the driver does not support power management at present.
> The use of iwconfig power commands such as the following will fail:
> iwconfig wlan0 power on
> --- clip ---
> But when I type
> iwconfig wlan0 power saving 1
> The power consumption drops from 0.42A to 0.26A. The latencies with ssh
> over wlan increases significantly, but it still works. The wireless chip
> cover is quite warm but at least it doesn't burn my finger anymore.
> I don't know what the power parameters mean exactly, so they probably
> could be tuned a bit. I made my tests first and only then checked the
> wiki page again and that's why I tested with "saving 1" instead of just
> "on". The "on" seems to work as well, though.
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