lenovo-21bx: WiFi drops out frequently

Describe your issue

What's the expected behaviour?

Wifi should be reliable, connections to services (HTTP, whatever) should work.

What's the current behaviour?

I experience service connection failures when on Wifi. Networkmanager and kernel(dmesg) don't indicate any problems, the connection/interface stay up as far as they are concerned. Several times per hours connections to websites, servers, etc fail on the system. It usually starts working again (automatically) after a few seconds/minutes, or I can restart the connection in nmcli (for example) and that usually brings it back for a few minutes until it happens again.

The same problem happens with iwd too.

How to reproduce your issue?

Currently using the 6.6 kernel in pmaports. WiFi network is both 2.4GHz and 5GHz, problem happens when connected to both. Network is using WPA2 auth.

What device are you using?

device-lenovo-21bx

On what postmarketOS version did you encounter the issue?

• edge (master branch)

• v23.06

• v22.12 (Supported until 2023-07-06)

• I confirm that the issue still is present after running sudo apk upgrade -a

On what environment did you encounter the issue?

Environments

• GNOME Shell on Mobile
• Phosh
• Plasma Mobile
• Sxmo (Wayland/Sway) Please post the output of sxmo_version.sh
• Other: Sway

How did you get postmarketOS image?

• from https://images.postmarketos.org
• I built it using pmbootstrap
• It was preinstalled on my device

What's the build date of the image? (in yyyy-mm-dd format)

2023-10-18

Additional information

I noticed that if I disable WiFi PM, the connection is reliable: iw wlan0 set power_save off