FS#70985 - Low Rx Rate on 802.11ax using Intel AX200

Attached to Project: Arch Linux
Opened by beta990 (beta990) - Saturday, 22 May 2021, 09:47 GMT
Last edited by Andreas Radke (AndyRTR) - Sunday, 23 May 2021, 09:27 GMT
Task Type Bug Report
Category Kernel
Status Closed
Assigned To Jan Alexander Steffens (heftig)
Architecture All
Severity Medium
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Description:
My Intel Wi-Fi 6 AX200 keeps reporting a really low Rx speed, using Windows 10 (dual-boot) with the latest drivers, the Rx speed is normal and the Wifi card is performing far better.

If I disable 802.11ax (on router or using iwlwifi disable_11ax=y) the issue disappears, but it doesn't use the full potential of my router. I think this is a firmware Linux bug, as it doesn't show up anywhere else.

Additional info:
* linux-zen 5.12.5-zen1-1-zen
* linux-firmware 20210511.7685cf4-1
* https://bugzilla.kernel.org/show_bug.cgi?id=213173

Steps to reproduce:
* On Windows 10 (dual boot), 802.11ax works fine.
This task depends upon

Closed by  Andreas Radke (AndyRTR)
Sunday, 23 May 2021, 09:27 GMT
Reason for closing:  None
Additional comments about closing:  User error
Comment by beta990 (beta990) - Saturday, 22 May 2021, 10:51 GMT
Downgrading the kernel to LTS fixes the problem:

Linux desktop 5.10.38-1-lts #1 SMP Wed, 19 May 2021 08:46:06 +0000 x86_64 GNU/Linux
Comment by beta990 (beta990) - Sunday, 23 May 2021, 08:26 GMT
I'm sorry for the noise, turns out this was a hardware issue (1/2 antennes weren't connected). Strange that `linux-lts` does seem to use a different antenne setup, at least that's what I think.

I've reported this upstream, but for now this isn't a bug, more an user error. :)

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