Bug 213173 - Low Rx Rate on 802.11ax using AX200 (Linux only)
Summary: Low Rx Rate on 802.11ax using AX200 (Linux only)
Status: NEW
Alias: None
Product: Drivers
Classification: Unclassified
Component: network-wireless-intel (show other bugs)
Hardware: Intel Linux
: P1 normal
Assignee: Default virtual assignee for network-wireless-intel
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2021-05-22 09:41 UTC by beta990
Modified: 2021-05-22 12:36 UTC (History)
0 users

See Also:
Kernel Version: 5.12.3
Subsystem:
Regression: No
Bisected commit-id:

Attachments
router-linux-speed (100.97 KB, image/png)
2021-05-22 09:41 UTC, beta990 		Details
router-windows-speed (77.26 KB, image/png)
2021-05-22 09:41 UTC, beta990 		Details
iperf3-linux (2.78 KB, text/plain)
2021-05-22 09:42 UTC, beta990 		Details
iperf3-windows (2.95 KB, text/plain)
2021-05-22 09:42 UTC, beta990 		Details
Add an attachment (proposed patch, testcase, etc.)

Description beta990 2021-05-22 09:41:16 UTC 
Created attachment 296931 [details]
router-linux-speed

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 (see results).

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.
Comment 1 beta990 2021-05-22 09:41:42 UTC 
Created attachment 296933 [details]
router-windows-speed
Comment 2 beta990 2021-05-22 09:42:21 UTC 
Created attachment 296935 [details]
iperf3-linux
Comment 3 beta990 2021-05-22 09:42:39 UTC 
Created attachment 296937 [details]
iperf3-windows
Comment 4 beta990 2021-05-22 10:51:40 UTC 
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 5 beta990 2021-05-22 12:36:48 UTC 
So it seems 1/2 antenna connector wasn't connected to the board. After the reattach the issue seems to be gone. :)

It makes me wondering if Windows only uses 1 antenna (knows it can only use one), and Linux needs both antenna connectors?
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