From: Brandon Nielsen <nielsenb@jetfuse.net>
To: Ben Greear <greearb@candelatech.com>, linux-wireless@vger.kernel.org
Subject: Re: iwlwifi: AX201 not using 2 receive streams
Date: Fri, 14 Jan 2022 11:22:26 -0600 [thread overview]
Message-ID: <dab1abfd-572f-3b4d-4abb-499f61fc91ee@jetfuse.net> (raw)
In-Reply-To: <679864d0-25da-b3c7-b1da-c77deb52fd3a@candelatech.com>
On 1/13/22 11:12 AM, Ben Greear wrote:
> On 1/11/22 11:46 AM, Brandon Nielsen wrote:
>> On 1/8/22 3:22 PM, Ben Greear wrote:
>>> 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
>>>
>>
>> I'm still seeing this as far back as 5.11.12, so I'm not convinced
>> this is a regression. At least for the 5 GHz / 802.11ac case.
>>
>
> Our engineer Chuck Rekierre bisected the problem we saw to a patch that
> came in as part of a stable patch.
>
> Please see his revert patch: [PATCH] Revert "iwlwifi: mvm: disable
> RX-diversity in powersave"
> posted yesterday, and if you get a chance to test this, please let us
> know the results.
>
> Thanks,
> Ben
>
Just tried it on one of the AX200 systems exhibiting the issue. No
change. Rock solid MCS 9, but no engagement of the second RX stream.
next prev parent reply other threads:[~2022-01-14 17:22 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-08 20:50 iwlwifi: AX201 not using 2 receive streams Brandon Nielsen
2022-01-08 21:22 ` Ben Greear
2022-01-11 19:46 ` Brandon Nielsen
2022-01-11 20:02 ` Ben Greear
2022-01-13 17:12 ` Ben Greear
2022-01-14 17:22 ` Brandon Nielsen [this message]
2022-01-17 19:46 ` Brandon Nielsen
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