Dear Christian,
Thank you for the response! Indeed, when I used the latest
compat-wireless, I was able to control the output power.
Now, another question arises: what is the lowest supported
power level? Do you have any hardware specifications of
AR9170 that would say what is the lowest power level
supported by the hardware?
With iw/iwconfig commands, the lowest achievable power is
1 dbm. But I'm thinking about modifying your code in order
to write fixed values to the corresponding registers. And
I need to know what to write into the registers in order
to obtain the lowest possible power :-) . I know that
there exist wifi cards that accept -12 dbm (e.g., Intel
Pro-Wireless 2200 with ipw2200 driver under linux), so it
would be really nice to know what I can get with
Atheros...
Cheers,
Michal
On Mon, 25 Jun 2012 19:33:10 +0200
Christian Lamparter <chunkeey@xxxxxxxxxxxxxx> wrote:
On Monday, June 25, 2012 12:38:50 PM Michal Kudelski
wrote:
Thus, my question is: is the function of changing the
txpower really supported? If it is, what steps should I
take to make it work? I tried with ifconfig up/down when
I
change the txpower, but it does not change anything.
Maybe
I do something wrong? Do I use the correct versions of
the
firmware and the driver?
No special firmware or driver is required. Just as long
as the driver supports the feature.
I've noticed a patch related to this issue, published on
2012-01-27 by Christian Lamparter. It seems that it is
included in my driver version, but maybe I'm wrong and I
should apply some additional patch?
We use NetGear WNDA3100(v1) hardware [Atheros
AR9001U-(2)NG] and carl9170 driver
(driverversion=3.0.0-21-generic firmware=1.9.2).
That's probably too old. The patch you are talking about
is not a -stable patch so it's not backported to 3.3.x
(or older) kernels.
So, either you can upgrade to 3.4, use compat-wireless
<http://linuxwireless.org/en/users/Download/#Getting_compat-wireless_on_Ubuntu>
or backport the patch yourself (however, this could be
diffcult).
Regards,
Christian
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