[Bug 219057] Re: Bluetooth does not coexist with WiFi

[Pavel D.]

Hi everyone,

I had the same wifi/bluetooth interference problem. My setup is as follows: 
- Ubuntu 14.04 with custom-built vanilla kernel 4.3.0
- Lenovo B50 laptop having QCA9565 / AR9565 Wireless Network Adapter (ath9k) onboard
- Linksys WRT-54GL router running DD-WRT v24-sp2 (10/10/09) mini
- Marshall Acton bluetooth speaker

Initially when I was streaming audio to the speaker, wifi degraded
dramatically. After doing some research, I have successfully resolved
the issue.

What I have done is:

* On my laptop:

- added 
```
Enable=Source
Disable=Socket
AutoConnect=True
```
to /etc/bluetooth/audio.conf

- Added 
```
options iwlwifi 11n_disable=1 bt_coex_active=1
``` 
to /etc/modprobe.d/iwlwifi.conf
However, since I'm not using iwlwifi, I'm not sure whether this had had any effect whatsoever.

* On my router:

- Under Wireless / Advanced Settings, I set "Bluetooth Coexistence Mode"
to "Preemption"


Then I've rebooted everything just in case.

FYI, I encourage you to read through
https://wireless.wiki.kernel.org/en/users/documentation/bluetooth-
coexistence to find out what bluetooth coexistence is, and I wonder why
everybody keeps switching it off (by setting bt_coex_active=0). On the
contrary, this technique is designed to defeat interference problem.

Also, you may find nice to add "load-module module-switch-on-connect" to
/etc/pulse/default.pa so that audio starts streaming to bluetooth
speaker automatically when it connects (and then back to laptop speakers
when it disconnects.)

Cheers,
PD.

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https://bugs.launchpad.net/bugs/219057

Title:
  Bluetooth does not coexist with WiFi

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