Cannot use 80MHz channel

[Michal Kazior]

On 17 December 2013 22:51, Li Sun <lsun3 at buffalo.edu> wrote:
> Hi,
>
> I am trying to play around with the ath10k driver. I have two Qualcomm
> Atheros QCA9880 Version 2 802.11ac chipsets. I put one of the cards in
> AP mode using hostapd and connect the other one as a client.
>
> I am using the hostapd config mentioned at
> "wireless.kernel.org/en/users/Drivers/ath10k/configuration". The
> client connects but the throughput is just around 300 Mbps (suggesting
> 40 MHz channel-width) and NOT any higher. It seems I am unable to use
> the 80 MHz channel-width. Also, when I checked the kernel logs
> (dmesg), I found the following message on the client side only:
>
> capabilities/regulatory prevented using AP HT/VHT configuration, downgraded
>
>
> Could this problem be related to CRDA ? I am in the US.

Check output of `iw reg get`. If you see no entries with `@ 80` you
have to upgrade your regdb.


Michał