On 10/03/16 12:35, stan wrote:
On Thu, 10 Mar 2016 07:55:05 +1100
Stephen Morris <samorris@xxxxxxxxxxxxxxx> wrote:
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?
I'm not an expert on this, but my take on the code is that it had to be
explicitly set. And I can't answer your question about whether it is a
problem for single channel if dual channel is set. The code looked
pretty complex, I didn't look in depth, and I don't have the background
to really understand it. An incompatibility would explain why it isn't
set, but I can't see expert developers like those who work on the
kernel not allowing for that situation to be harmless.
Before worrying about incompatibilities, you could try to compile a
kernel with the config switch set. If that kernel works with your
card, then you could worry about how to deal with incompatibilities, if
there are any. Maybe by booting different kernels for different cards;
crude but effective.
http://fedoraproject.org/wiki/Building_a_custom_kernel
I don't really know enough to answer your questions, but I think this
is at least a possible explanation for your difficulties with the card
you have.
I could compile the kernel to set the flag, as a wireless connection
speed jumping from 525Mbps on 2.4GHz to 1.3Gbps on 5GHz can be
significant, especially when streaming. I'll need to research how to
compile a kernel under Fedora, and what additional source packages I
need (I found some documentation on this on the net), as it is about 10
years since I last compiled a kernel.
I was just hoping it would be automatically done in the kernel, as with
the previous usb card I had, I found it a pain to have to compile the
driver every time the kernel changed and to have to go back to the web
site every so often to get an updated version of the driver source
because what I had didn't support the kernel I was using.
regards,
Steve
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