Regular firmware crashes with QCA6174

[Michal Kazior]

On 7 January 2017 at 22:41, Shaun Crampton <shaun at cantab.net> wrote:
> Hi,
>
> I'm getting regular QCA6174 firmware crashes on Ubuntu 16.10 with the
> QCA6174 (new Dell XPS 13, which shipped with Ubuntu 16.04).  Crash
> seems to be at random, roughly every 30 minutes.  After the crash,
> wifi stops working until I turn it off and on again.
>
> Any help or workaround appreciated.  I've copied the dmesg log in
> below.  I have the latest firmware from linux-firmware in
> /lib/firmware.
>
> Please CC in me any responses.
>
> Thanks,
>
> -Shaun
>
> [ 3683.563419] wlp58s0: AP 00:07:26:aa:e0:45 changed bandwidth, new
> config is 2472 MHz, width 2 (2462/0 MHz)

Your AP seems to be toggling HT20 and HT40.

Can you force your AP to run at HT20 at all times, please? If the
problem ceases it'll strongly point to firmware's rate control
becoming confused (e.g. due to driver not properly telling it how
peer's capabilities have changes).


Michał