RE: RTL8851BE: 5 GHz 80 MHz/HE beacon loss then auth timeout since 7.3

[Ping-Ke Shih <pkshih@realtek.com>]

Tan Hao <guwolf@guwolf.com> wrote:
> Hi,
> 
> On RTL8851BE, 5 GHz 80 MHz/HE association succeeds, then the STA
> loses beacons within about one second. After that, every 5 GHz
> authentication times out until rtw89_8851be is unloaded. 2.4 GHz
> and 5 GHz HT20/HT40 stay up. This started in 7.3.0; 7.2.11 is fine
> with the same firmware file.

The changes between 7.3.0 and 7.2.11 related to RTL8851BE are mostly
BT-coexistence patches (if I read correctly), so you can quickly
check if it works well with BT disabled.

> 
> I am still bisecting. This is a report only, no patch yet.

Thanks. Please bisect the cause. 

> Reproducer
> 
>   1. Boot 7.3.x with the stock rtw89 driver (do not mask HE/VHT).
>   2. Connect to either 5 GHz BSSID above (SAE or PSK, same result).
>   3. Association completes; beacons are lost ~1s later.
>   4. Re-auth to any 5 GHz AP times out. 2.4 GHz still works.

For this point, BT might be not related because it works on 2.4GHz band, but
if it is not too hard, please try to disable BT.

>   5. Recovery: modprobe -r rtw89_8851be rtw89_8851b rtw89_pci rtw89_core
>      && modprobe rtw89_8851be
>      The next 5 GHz attempt can associate once, then the same loss
>      repeats.

This is a little weird to me. RTL8851BE becomes idle (power off) after
disconnection. It is very like reload modules. Not sure what they are
different?

> 
>   UINT_MAX (WPA2-PSK) is the same pattern; one run associated, then:

What does UINT_MAX mean?

> What does work on the same 7.3.3 kernel
> 
>   Forcing HT-only (wpa_supplicant disable_he=1 disable_vht=1), so the
>   AP falls back to HT20/HT40 on 5745 MHz:

Does it work if not disable_vht? (To clarify if RTL8851BE misbehavior
on bandwidth 80MHz.)