Problem with spectral scan in VHT80 mode

Gaurang Ramesh Naik gaurang at
Mon Jun 13 22:08:29 PDT 2016

Apologies for my previous e-mail. I had read the whole page once, but
somehow I missed the point about 64 bins for VHT80. It's working now.

On Tue, Jun 14, 2016 at 12:37 AM, Gaurang Ramesh Naik <gaurang at> wrote:
> Hello,
> I was trying the ath10k's spectral scan. I used the following commands
> given on the link
> echo 8 > /sys/kernel/debug/ieee80211/phy0/ath10k/spectral_count
> echo manual > /sys/kernel/debug/ieee80211/phy0/ath10k/spectral_scan_ctl
> echo trigger > /sys/kernel/debug/ieee80211/phy0/ath10k/spectral_scan_ctl
> cat /sys/kernel/debug/ieee80211/phy0/ath10k/spectral_scan0 >> /tmp/fft.dump
> I am using OpenWrt Bleeding edge. In the HT20 and HT40 mode, I
> correctly get 8 samples. However, in the VHT80 mode, the /tmp/fft.dump
> file generated is empty.
> In the open issues on the above link, it said that the HT40 and HT20
> modes ignore the count parameter. That isn't the case for me. I seem
> to get correct # of samples (I view the dump file using
> However, in the VHT80
> mode, there seems to be no output. Am I doing something wrong here?
> Thanks,
> Gaurang.

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