Regression: 6.1.0.9-1009 causes RTL8852BE WiFi to fail randomly

[Liam Coogan]

The 6.1 OEM kernel contains backported (from 6.2) support for the RTL8852BE wireless adapter. This has worked fine on my laptop since the support was backported.

The latest release, 6.1.0.9-1009 is causing my adapter to occasionally stop working completely. The WiFi disconnects, and GNOME tells me an adapter cannot be found. A reboot is required to get the internet working again. This has happened twice.

Running `dmesg` reports a lot of error messages with the adapter - find the output in error.txt, attached.

Thanks for any help you can offer

[Liam Coogan (bimblesticks)]

I'm very out of my depth here, but I wonder if this is the offending commit: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=84d0e33e51df7922933e48b48f6b1c5b76e5bbfc

The patch claims to target the 8852c, but considering it contains the error messages "read rf busy swsi" and "write rf busy swsi" I think it may affect the 8852b as well. However, I can't find it listed in the changelog for 6.1.0.9-1009, so it may not even be in the kernel in which case my apologies.

The other patch of note concerning this card is this https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2012019

I've now experienced the bug two more times, on a different WiFi network.

[Liam Coogan (bimblesticks)]

Not only does this bug still persist, but I have now started experiencing serious issues on the 6.1.0.8-1008 build as well.

However, a long line of google-fu led to me this bug report: https://github.com/lwfinger/rtw89/issues/240#issue-1680099655, with this comment by Larry Finger: https://github.com/lwfinger/rtw89/issues/240#issuecomment-1520403745, which appears to be referring to this patch: https://github.com/lwfinger/rtw89/commit/83f33c87e716a9cdb1c52e70a51d91e12fa7e1b0

I have a Lenovo laptop, so I'm wondering if my BIOS is the issue.

[Liam Coogan (bimblesticks)]

OK! I've been able to resolve all issues by creating the file /usr/lib/modprobe.d/70-rtw89.conf with the following line: options rtw89_pci disable_clkreq=y disable_aspm_l1=y disable_aspm_l1ss=y

Looks like it is, after all, a BIOS issue with my Lenovo Ideapad 5 15 ABA7. Am unsure if there's anything you folks might want to merge, so will leave this report open.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Aaron Peromsik (aperomsik)]

Similar behavior on HWE kernel in 22.04 on Thinkpad E16.

Linux ernie 6.2.0-39-generic #40~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Nov 16 10:53:04 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

[Timo Aaltonen (tjaalton)]

oem-6.1 is about to be EOL

[Hiren Rathod (teddy03)]

Hello, I tried to follow the solution of @Liam Coogan (bimblesticks) but wasn't able to solve the problem.

```
wlp1s0: unavailable
        "Realtek Renoir/Cezanne GPP Bridge"
        wifi (rtw89_8852be), E0:0A:F6:A8:3C:23, hw, mtu 1500
```

I tried `sudo ip link set wlp1s0 up` but it gives me `RTNETLINK answers: Connection timed out`