ath10k FAQ

ath10k FAQ

[Kalle Valo]

Hi,

I created a small FAQ to the wiki and added the four questions which
seem to be popular:

http://wireless.kernel.org/en/users/Drivers/ath10k/faq

Comments welcome. And feel free to update it with new questions.

-- 
Kalle Valo

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Re: ath10k FAQ

[Avery Pennarun]

On Tue, Apr 8, 2014 at 3:41 AM, Kalle Valo <kvalo@qca.qualcomm.com> wrote:
> I created a small FAQ to the wiki and added the four questions which
> seem to be popular:
>
> http://wireless.kernel.org/en/users/Drivers/ath10k/faq
>
> Comments welcome. And feel free to update it with new questions.

This seems helpful.  For the first question ("can't set channel") I
think the provided answer is not the only cause of the problem, and
was not the one that confused me at first.  For me, the main confusion
was that it's pretty non-intuitive how to set the 80 MHz center
frequency in hostapd.conf ("the center frequency of the channel 6
higher than the lowest channel number in the 4-channel group").  It
might help if you could include an example for that.  I guess it
varies by country so it might be a little tricky.

Have fun,

Avery

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Re: ath10k FAQ

[Kalle Valo]

Avery Pennarun <apenwarr@gmail.com> writes:

> On Tue, Apr 8, 2014 at 3:41 AM, Kalle Valo <kvalo@qca.qualcomm.com> wrote:
>> I created a small FAQ to the wiki and added the four questions which
>> seem to be popular:
>>
>> http://wireless.kernel.org/en/users/Drivers/ath10k/faq
>>
>> Comments welcome. And feel free to update it with new questions.
>
> This seems helpful.

Especially for me as now I can just answer with an URL ;)

> For the first question ("can't set channel") I think the provided
> answer is not the only cause of the problem, and was not the one that
> confused me at first. For me, the main confusion was that it's pretty
> non-intuitive how to set the 80 MHz center frequency in hostapd.conf
> ("the center frequency of the channel 6 higher than the lowest channel
> number in the 4-channel group"). It might help if you could include an
> example for that. I guess it varies by country so it might be a little
> tricky.

Good point. I tried to improve the answer a bit now:

----------------------------------------------------------------------
Why I cannot start an AP in an 80 MHz channel / in 11ac mode?

If you get "nl80211: Failed to set channel" error from hostapd, most
likely that means that regulatory database doesn't support 80 MHz
channels (which were introduced in 11ac). You can check that with iw:

$ iw reg get
country FI: DFS-ETSI
        (2402 - 2482 @ 40), (N/A, 20)
        (5170 - 5250 @ 80), (N/A, 20)
        (5250 - 5330 @ 80), (N/A, 20), DFS
        (5490 - 5710 @ 80), (N/A, 27), DFS
        (57240 - 65880 @ 2160), (N/A, 40), NO-OUTDOOR

If you do not see "@ 80" within the frequency range you are using, it
means that the regulatory database doesn't support 80 MHz channels.

Other problem is that configuring VHT (= 802.11ac) in hostapd is not
very intuitive, pay extra attention how you configure it. Especially
vht_oper_centr_freq_seg0_idx is challenging. See example configuration
and hostapd configuration file documentation.
----------------------------------------------------------------------

I'm trying to maintain all configuration related documentation in
respective pages and that's why I just have pointers in the FAQ.

-- 
Kalle Valo

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