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Help debugging iwldvm / ath10k stalls

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I have an old iwldvm station (Intel(R) Centrino(R) Ultimate-N 6300
AGN, REV=0x74) and a new ath10k AP (QCA9880-BR4A, I think, as found in
the TP-Link Archer C7 vs).  The former is Fedora's 3.14 kernel and the
latter is OpenWRT trunk from a few days ago.

Every now and then, my connection drops out.  From wireshark on the
station, it looks like traffic from the AP to the STA is coming
through but traffic from the STA to the AP is not.  I could be wrong
here, though.  Nothing is logged in either machine's kernel log.
After 5 seconds to a couple minutes, everything starts working again.

A couple of Apple devices using the same radio on the same AP seem to work fine.

Any advice for debugging this?  I don't know where to start.

Thanks,
Andy
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