On 08/03/16 11:25, stan wrote:
On Tue, 8 Mar 2016 07:14:00 +1100
Stephen Morris <samorris@xxxxxxxxxxxxxxx> 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.
Thankyou for your response. I've just checked the config for the 4.4.3
kernel and CONFIG_ATH9K_CHANNEL_CONTEXT isn't set at all. I could
compile the kernel to set that flag, but is there any chance that it
would be set by default in the kernel, or does it cause problems if the
adapter isn't actually dual channel?
regards,
Steve
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