Bad wifi performance on WPA3 (5 GHz) access points since 20240914

Expected Behavior

Up- and download speeds should easily exceed 30 Mbps.

Current Behavior

Up- and download speeds are limited to around 30 Mbps.

Steps to Reproduce

Connect to a WPA3 wifi network and measure the transfer speeds.

Additional Information

I have played around with some access point setups:

• WPA2-only, MFP disabled: Throughput is perfectly fine.
• WPA2-only, MFP optional: Throughput is limited to around 30 Mbps.
• WPA2-only, MFP required: Throughput is limited to around 30 Mbps.
• WPA2/WPA3-mixed: Throughput is limited to around 30 Mbps.
• WPA3-only: Throughput is limited to around 30 Mbps perfectly fine (Edit 2024-10-06).

According to this, my issue seems to be related to whether PMFs are enabled or not. I did some digging and believe this regression to be due to this commit 18a5696. Apparently this was supposed to fix wifi throughput on legacy WPA2 networks without MFP (cf. #7584 (closed)), but for me, it seems to have crippled wifi throughput on any network that uses Management Frame Protection.

Device information

/codename bramble /version lineage-21 /date 2024-09-21 /kernel 4.19.294-g18a5696f48de #1 Sat Sep 21 03:43:28 UTC 2024 /baseband g7250-00264-230619-B-10346159 /mods Google Apps

I have read the directions.