Re: Problem with 40Mhz on 2.5GHz with Intel 8260

[Volker Mische <volker.mische@gmail.com>]

Hi,

On 09/20/2016 08:22 AM, Volker Mische wrote:
> On 09/20/2016 07:39 AM, Emmanuel Grumbach wrote:
>> On Mon, Sep 19, 2016 at 5:00 PM, Volker Mische <volker.mische@gmail.com> wrote:
>>> I'm having connectivity issues with an Intel 8260 on a 2.5GHz network
>>> when using 40Mhz. I'm getting errors like
>>>
>>>     Queue 2 stuck for 10000 ms.
>>>
>>> I've upgrade my system to the firmware version 21 (21.373438.0) and
>>> Kernel 4.8.0-rc6 in hope that it fixes the issue and to be able to debug
>>> the problem.
>>>
>>> I then found the page about platform noise [1]. I don't have any issue
>>> for several hours now (normally I was hitting the issue every few
>>> minutes) as I've set the cfg80211_disable_40mhz_24ghz parameter.

>> We tried a few times to debug those, but they take a very long time to debug
>> since typically we need lots of reproductions and the firmware team
>> doesn't always
>> the time to look at the data immediately so in the end, the people who
>> reported this
>> originally went away.
>> Note that 40MHz on 2.4GHz is not an optimal configuration in crowded
>> environment,
>> but if you live in a place where you are pretty much the only one using those
>> frequencies, then, it can be beneficial.
> 
> It's at home. I normally see only one other wifi (I need to check which
> frequency that one is using).
> 
> 
>> What you can try is to disable low power states (by using power_scheme
>> in iwlmvm) and see if it helps.
> 
> I will try that.

I've set the iwlmvm power_scheme to 1 (and allowed the 40Mhz
connection). First I thought it's good, but after a while the queue
still got stuck. Especially after waking up from a suspend (not sure if
that matters).

What are the next steps?

>>> [1]:
>>> https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi#about_platform_noise

Cheers,
  Volker