Subject: Re: iwlwifi: AX201 not using 2 receive streams
To:     Brandon Nielsen <nielsenb@jetfuse.net>,
        linux-wireless@vger.kernel.org
References: <3cb11500-6828-6ded-bebc-cdb6e1f97bc0@jetfuse.net>
From:   Ben Greear <greearb@candelatech.com>
Organization: Candela Technologies
Message-ID: <521b0dba-5866-ff34-da5a-479bc95cc9d9@candelatech.com>
Date:   Sat, 8 Jan 2022 13:22:37 -0800
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On 1/8/22 12:50 PM, Brandon Nielsen wrote:
> I have a system with Intel AX201 not using 2 spatial streams in the RX (download) direction. TX (upload) functions as expected. I'm seeing similar behavior with 
> an AX200 system. I'm seeing the same behavior on 5.15.12 as I am with 5.16.0-rc8 so I didn't mark it as a regression. Windows works as expected.
> 
> I have opened bug 215465[0] with some more detail.
> 
> [0] - https://bugzilla.kernel.org/show_bug.cgi?id=215465
> 

We saw something similar with ax210, but only on 6E, in kernel 5.15.7+.  On 5Ghz, it worked 2x2 as expected.
On a 5.15.0-rc something, it worked OK for us.

We verified same firmware is used in both cases, but have not fully bisected the problem yet but we are
working on it.  In case you find the problem patch before us, please let me know!

Thanks,
Ben

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