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Sender: Larry Finger <larry.finger@gmail.com>
Subject: Re: rtw88: Guaranteed system freeze with RTL8821CE with RFE 2 type
To:     rtl8821cerfe2 <rtl8821cerfe2@protonmail.com>,
        "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
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From:   Larry Finger <Larry.Finger@lwfinger.net>
Message-ID: <65c86fe7-f1f1-445f-40c2-25ceaa4e4fb6@lwfinger.net>
Date:   Sun, 9 May 2021 20:16:55 -0500
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On 5/9/21 2:35 PM, rtl8821cerfe2 wrote:
> Hi!
> 
> My system freezes if I use this driver. My laptop's wifi card is RTL8821CE, type RFE 2. My laptop is HP 250 G7, model 6MQ29EA.
> 
> It happens within a few minutes after booting if I don't do anything out of the ordinary. If I do a speed test at speedtest.net, the system usually freezes during the test. I have to hold the power button to shut it down.
> 
> This happens with the 5.12/5.12.1 kernel provided by Arch Linux, but it also happens with the latest rtw88 code from https://github.com/lwfinger/rtw88, revision 22f319b11d6d3c4a3ac9e1f90e3433ed9f5ecf11.
> 
> I have been using the driver from https://github.com/tomaspinho/rtl8821ce since late 2019 with no problems, even with Linux 5.12/5.12.1.
> 
> I tested all combinations of rtw_pci parameters "disable_msi" and "disable_aspm". Nothing helped.
> 
> I set up netconsole and added the parameter "loglevel=7" to the kernel command line. Unfortunately all the messages that came through netconsole also appear in journalctl, so I got no new information that way. I used the driver from the stock Arch Linux kernel for this test.
> 
> I'm attaching the file "journalctl-nono.txt", which contains the output of "sudo journalctl _TRANSPORT=kernel" from the time I tested the code from lwfinger/rtw88.
> 
> I'm also attaching the file "journalctl-senorsnor.txt", which comes from another user who has the same problem. Their wifi card is also RFE 2. Maybe there is something relevant, I don't know.
> 
> I'm happy to provide more information, test possible fixes, etc.
> 

The only splat that shows in either attachment is due to you not installing the 
regulatory database that sets the channels etc. for your domain. I do not know 
what it is called for your distro - it is wireless-regdb on mine. It is unlikely 
that this is the cause of your problem, but who knows?

Larry