Intermittent "failed to stop TX DMA"

Arend van Spriel arend
Thu May 7 02:31:44 PDT 2015

On 05/06/15 20:10, Norman Henderson wrote:
> Hi, I am getting intermittent messages (a burst e.g. 6 in a 5 min period
> then nothing for an hour or more):
> ath: phy0: Failed to stop TX DMA, queues = 0x002! (or 008 or 00a or 100
> or 102 or...)

As this seems typically a driver/hardware issue I would suggest to try 
on ath9k-devel at


> Initially I was running on a Dell Optiplex 390, Ubuntu 14.04.2/ hostapd
> 2.1/ ath9k (all stock, as distributed via Ubuntu). All fully patched
> (kernel 3.16.0-36-generic). Then I installed the latest backports stable
> version of ath9k and the messages seemed to be less frequent - but
> didn't go away.
> The wireless card is a DLink DWA-566 (AR-9300) - pretty basic.
> Can anyone tell me what I am dealing with here? Is this a problem or
> just log spam? Is there a way to fix it?
> Thanks, Norm
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