On Tue, 8 Mar 2016 07:14:00 +1100
Stephen Morris <samor...@netspace.net.au> wrote:

> Hi,
> 
>      I am using a dual channel Dlink DWA192 wireless USB adapter.
> This adapter is supported in the kernel via the Ath9k driver, but
> only the 2.4GHz band is supported, the 5 GHz band is not. Looking at
> the Networkmanager connection speed statistics the speed alternates
> between 135Mb/s and 1Mb/s, which on a 600Mb/s link is terrible. On
> windows with the vendor supplied driver I get 565Mb/s on the 2.4GHz
> band and 1.3Gb/s on the 5GHz band. How do I determine why I'm not
> getting to full connection speed from the 2.4GHz band, and how do I
> determine why the kernel doesn't support the 5GHz band?

I took a quick look at the kernel code.  There is a switch that sets
whether the ath9k uses 2 channels, CONFIG_ATH9K_CHANNEL_CONTEXT.  If
that isn't set to 2 for the kernel you are running, then you won't have
access to the two channels.

Try going to /boot and running 
cat config-[for the kernel you are running] | grep -i ath9k

If it isn't set, you could compile a custom kernel to enable it.
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