Am 13.07.2015 um 13:52 schrieb Rolf Anderegg:
> 
>> First of all, you are using ancient kernel and firmware. Please update
>> it. Firmware should be at leas 1.4 and kernel probably 4.1 or later. i'm
>> not sure which include patch with support of RMW command introduced by
>> new FW.
>>
>> Then you can try to disable LED blinking which is stealing your usb
>> bandwidth.
> 
> Thanks for your suggestions.
> You say ancient, I was thinking longterm stable. For various reasons I
> require a RT patched kernel, alas this is not yet available for 4.1
> kernels. Aside from that I have updated the kernel and firmware as you
> propose. Also I have set ath9k_htc's blink=0. The kernel warnings are no
> longer occuring, however the AP's connection (which requires several
> attempts) is still dropped after a few seconds.
> I suspect that there are bandwidth/speed issues when dealing with USB
> adapters, but that does not inherently mean that the connection is prone
> to drop, right? Doesn't that mean that I am leaking packages somewhere
> along the way? What else could I be looking for?

The packages can drop if you will do channel scan. STA mode need some
seconds to complete channel scan. It means AP will be all the time
unavailable.

> Regards,
> Rolf Anderegg
> 


-- 
Regards,
Oleksij