Re: Force use of 5GHz band

[James Prestwood <prestwoj@gmail.com>]

On 9/14/23 11:13 AM, Jonas Große Sundrup wrote:
> Not right now, but if you give me a command that'd spit out what you
> want to see, I'll get them.
> 
> Just iwd -d and then trigger a scan in iwctl?

Yep that would do it.

> 
> On Thu, 2023-09-14 at 11:06 -0700, James Prestwood wrote:
>> Hi Jonas,
>>
>> On 9/14/23 10:44 AM, Jonas Große Sundrup wrote:
>>> Hi,
>>>
>>> is there a way to force iwd to use the 5GHz flavor of a specific
>>> wifi?
>>> I am aware of BandModifier5GHz, but even with setting this to 1000
>>> I
>>> still end up on the 2.5GHz band. That band specifically, however,
>>> is
>>> unfortunately suspect for some stability issues I'm facing and
>>> hence I
>>> would like to force iwd onto the 5GHz band to see if the problems
>>> still
>>> occur. That proves to be difficult, of course, if iwd is picking
>>> the
>>> 2.5GHz band…
>>>
>>> Even though I do see that iwd probably has the better insight into
>>> band
>>> stability from a signal-strength point of view, any chance of
>>> overruling iwd's internal mechanisms here? (Or should I just crank
>>> up
>>> BandModifier5GHz by a couple of magnitudes?)
>>
>> All we have now is BandModifier5GHz which is multiplied by the
>> computed
>> rank. The stock rank is based mainly on a data rate computation which
>> is
>> theoretical, but uses capabilities and signal strength to estimate.
>>
>> 1000 is pretty high, so essentially your 2.4GHz BSS's would need to
>> have
>> a rank 1000x larger than the 5Ghz ones. So either 5ghz is incredibly
>> low
>> signal, doesn't support HT/VHT, or maybe the IEs are malformed so the
>> data rate isn't being computed correctly e.g. (defaulting to basic
>> rates).
>>
>> Do you have debug logs of the scan results?
>>
>>>
>>>
>>> Thanks,
>>> Jonas
>>>
>