Re: Issue with ath9k and tx/rx chainmask: 3x3 doesn't work with mask of 0x1.

[Ben Greear <greearb@candelatech.com>]

On 08/22/2012 01:30 PM, Felix Fietkau wrote:
> On 2012-08-20 10:24 PM, Ben Greear wrote:
>> I am trying to test out an attenuator.  For now, I have only a single attenuator,
>> so I set tx and rx chainmask to 0x1 on both AP and Station machine.
>>
>> I then connected channel 0 on the two machines together through the
>> attenuator.
>>
>> I have two station interfaces on the station machine.  They both
>> seem to associate OK, but they cannot receive dhcp responses.
>>
>> It *seems* that broadcast packets may go through fine.
>>
>> If I force the rate down to 1x1 or 2x2 MIMO (or force disable /n
>> and just use /a), then it appears to work fine.
>>
>> Nics are WPEA-127n (AR9380).  Kernel is 3.5.1+ on AP, 3.5.2+ on station
>> machine.
>>
>> I can see why forcing it down to 1x1 might work around some issue,
>> but I find it funny that 2x2 works while 3x3 does not.
> Did you set the chainmask manually via debugfs? If so, don't do that!
> Use the nl80211 antenna control API (e.g. via iw)

I was using debugfs....will check out using 'iw'.

Thanks,
Ben

>
> - Felix
>


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com