linux-kernel - Re: Interaction issue of intel wifi and broadcom bluetooth - it appears that nobody feels responsible for doing something

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Date:	Fri, 05 Jun 2015 07:12:39 +0200
From:	Jonas Thiem <jonasthiem@...glemail.com>
To:	Jeremiah Mahler <jmmahler@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: Interaction issue of intel wifi and broadcom bluetooth - it appears
 that nobody feels responsible for doing something

Hi Jeremiah,

thanks for responding!

I did have my mobile phone very nearby also connected to the bluetooth
headphones while my laptop was still using 11n wifi. I didn't have any
noticeable issues with bluetooth there.

But I got the feeling that my phone's android drivers + hardware for
bluetooth are tuned better than the laptop ones, so maybe that just
means the phone is just better at jumping frequencies to avoid.

I guess the best test would be the same laptop model in direct
proximity, but sadly I only own that laptop once. ;)

I hope wireless interference wouldn't rule out that some driver work
would be considered to make it work better - after all, both chips are
in the same laptop and as per the intel comment, bluetooth is supposed
to work despite of wifi activity.

Regards,
Jonas Thiem

On 06/05/2015 06:45 AM, Jeremiah Mahler wrote:
> Jonas,
> 
> On Fri, Jun 05, 2015 at 01:00:32AM +0200, Jonas Thiem wrote:
>> Hi *,
>>
>> this is my first post to this mailing list, sorry if it's not supposed
>> to go here. (also CC in responses would be nice since I'm not
>> subscribed)
>>
>> I filed a bug about an intel centrino wifi interaction with broadcom's BCM2045B:
>> https://bugzilla.kernel.org/show_bug.cgi?id=97101
>>
> Those are some unhelpful replies :-(
> 
>> In short, the two seem to kinda fight over the wireless spectrum and
>> both drop connections all the time - unless the 'iwlwifi' module is
>> loaded with 11n_disabled=1.
>>
> 
> I don't have a solution but I think the problem is interesting.
> 
> Both Bluetooth and 11n share the same frequency band near 2.4 GHz so it
> is possible that they could conflict.  If you had two laptops, and you
> ran just Bluetooth on one and just 11n on the other, would they
> both have problems?  This would tell as whether it was something inside
> the kernel or if it was really wireless interference.
> 
> [...]
>>
>> Regards,
>> Jonas Thiem
> 

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