Re: rtw_8822ce wifi regression after kernel update from 5.15 to 5.16

[Larry Finger <Larry.Finger@lwfinger.net>]

On 4/3/22 13:11, G. P. B. wrote:
> Dear all,
> 
> Hopefully this email gets added to the thread correctly as I came here from 
> https://lore.kernel.org/linux-wireless/CAO_iuKG0gE=5fEKMF2A+iWUhsxtnPOQtTQTkBRo2vH5CmKu7iA@mail.gmail.com/ 
> <https://lore.kernel.org/linux-wireless/CAO_iuKG0gE=5fEKMF2A+iWUhsxtnPOQtTQTkBRo2vH5CmKu7iA@mail.gmail.com/>
> and using the mailto link with Gmail.
> 
> I'm also hitting this issue but I'm not sure if this is a regression in 5.16. 
> I've been struggling with weird random disconnects for a while but I blamed it 
> on the known bad router that I usually connect to at my university (at least 
> October 2021 when I got this laptop brand new).
> 
> The laptop is a HP Pavilion Laptop 15-eh0014na running Fedora 34:
> Linux fedora 5.16.18-100.fc34.x86_64 #1 SMP PREEMPT Mon Mar 28 14:46:06 UTC 2022 
> x86_64 x86_64 x86_64 GNU/Linux
> 
> Network driver:
> 02:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8822CE 802.11ac 
> PCIe Wireless Network Adapter DeviceName: Realtek Wireless LAN + BT Subsystem: 
> Hewlett-Packard Company Device 85f7 Kernel driver in use: rtw_8822ce Kernel 
> modules: rtw88_8822ce
> 
> A sample, similar to the ones of Nico, of the output of dmesg -w:
> [ 915.489081] rtw_8822ce 0000:02:00.0: timed out to flush queue 1 [ 915.599086] 
> rtw_8822ce 0000:02:00.0: timed out to flush queue 2 [ 915.711096] rtw_8822ce 
> 0000:02:00.0: timed out to flush queue 1 [ 915.822106] rtw_8822ce 0000:02:00.0: 
> timed out to flush queue 2 [ 916.265097] rtw_8822ce 0000:02:00.0: timed out to 
> flush queue 0 [ 916.376085] rtw_8822ce 0000:02:00.0: timed out to flush queue 1 
> [ 916.449083] rtw_8822ce 0000:02:00.0: failed to get tx report from firmware
> 
> I'm not very proficient at debugging Linux so not sure how much more I can help 
> to narrow down the issue.
> But maybe a description of my experience might help, the WiFi icon still 
> considers at all time to be connected to the router and have a perfect signal.
> Sometimes enabling and immediately disabling Airplane mode fixes the issue 
> (probably due to a restart of the module?), and the issue is more likely to come 
> up after waking up from sleep.
> 
> I will try to see if I can rollback the kernel to 5.15 and see if that fixes the 
> issue and report back.
> 
> If I can be of any other assistance please let me know.

George,

I do not know of any regression in 5.16 with regard to the driver for RTL8822CE. 
Certainly, I saw no regressions in my testing of that driver from before it was 
in the kernel up to the present. That said, I can only comment on the user-space 
part of openSUSE Tumbleweed, which is probably not your distro of choice.

Are you using the drivers at https://GitHub.com/lwfinger/rtw88.git rather than 
the ones in the kernel? Your posted errors that refer to rtw_8822ce indicate 
that to be true. If the drivers came from the kernel, the reference would be to 
rtw88_8822ce! If so, do a 'git pull' to get the drivers updated to match the 
code in kernel 5.18. A lot of things have been fixed.

In your system, please do a 'lsmod | grep rtw'. If any items refer to rtw88_*, 
you have mixed drivers loaded. In that case, you should blacklist the rtw88_* 
driver.

Larry