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From: Sujith Manoharan <c_manoha@qca.qualcomm.com>
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Date: Wed, 25 Apr 2012 07:20:56 +0530
To: Aseem Sharma <aseem.sharma19@gmail.com>
CC: <linux-wireless@vger.kernel.org>
Subject: Re: Survey dump does not seem to work with SONY USB Wireless LAN Adapter UWA-BR100
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Aseem Sharma wrote:
> Hello,
> 
> I was previously using Cisco Aironet wireless adapter (it uses ath5k
> driver); using which I was able to get the survey dump using the following
> command:
> 
> root@as75:~# iw phy phy0 interface add mon0 type monitor
> root@as75:~# ifconfig mon0 up
> root@as75:~# iw dev mon0 survey dump
> 
> Survey data from mon0
>         frequency:                      2412 MHz
>         noise:                          -95 dBm
>         channel active time:            11813 ms
>         channel busy time:              300 ms
>         channel receive time:           237 ms
>         channel transmit time:          0 ms
> 
> However, when I run the same commands after connecting SONY USB Wireless
> LAN Adapter UWA-BR100 (which internally uses ath9k_htc driver) I do not seem
> to get any output. Also, the command is successful (as I am running echo $?
> which returns ‘0’)

ath9k_htc currently doesn't support survey dump.

Sujith