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Date:   Wed, 28 Jun 2023 16:28:28 +0300
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Subject: Re: Realtek 8822ce connection is very unstable
To:     Giulio Paci <giuliopaci@gmail.com>,
        Ping-Ke Shih <pkshih@realtek.com>
Cc:     James <bjlockie@lockie.ca>, linux-wireless@vger.kernel.org
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From:   Bitterblue Smith <rtl8821cerfe2@gmail.com>
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On 28/06/2023 13:35, Giulio Paci wrote:
> Il mer 28 giu 2023, 03:29 Ping-Ke Shih <pkshih@realtek.com> ha scritto:
>> Try below options to see if they can help:
>>
>> 1. try another band (switch from 2GHz to 5GHz or opposite)
> 
> I tried to force 5GHz. And then to force 2GHz. When connected to 5GHz
> it seems a little bit more stable, but still hangs within seconds.
> 
>> 2. try another AP
> 
> I have tried 2 different AP, but the situation is very similar with
> both. One of them supports only b/g/n, so I was able to change band
> only with the other one (which is a hotspot on Android phone).
> 
>> 3. disable WiFi power save by
>>    rtw88_core.ko disable_lps_deep=1
>>    or
>>    iw wlan0 set power_save off
> 
> I tried setting disable_lps_deep=1, but still the connection seems unstable.
> 
>> By the way, when you try disable_aspm=1 and disable_msi=1, I suggest to
>> create a file and add them to /etc/modprobe.d/, and then shutdown and turn on
>> your computer after a while. Because some PCI settings are persistent if only
>> do rmmod/insmod.
> 
> I confirm this is the approach I used in all my attempts, including
> disable_lps_deep=1.
> I also checked /sys/module/$module/parameters/$option content, to
> confirm that the options were correctly set.
> 
> I have also carried out some additional attempts:
> 
> - boot with iommu.passthrough=1 instead of pcie_aspm=off, but it does
> not seem to improve anything (and AER errors came back in the dmesg);
> - After my comments on https://github.com/lwfinger/rtw88/issues/150,
> https://github.com/lwfinger/rtw88/ was updated and I was able to load
> these modules. The connection is still very unstable, but with these
> modules, when the connection hangs, dmesg reports:
> 
> rtw_8822ce 0000:03:00.0: firmware failed to leave lps state
> 
> sometimes followed by:
> 
> rtw_8822ce 0000:03:00.0: failed to send h2c command
> 
> I have tried to set some of the options above using modules from
> https://github.com/lwfinger/rtw88/, but so far, apart from these
> additional messages, the results are almost identical to the
> precompiled modules that come with Debian.
> 
> 
> One of my colleagues has the same hardware (same AP model and same
> laptop model) and also tried to install Debian bookworm on it. I asked
> to check if he experiences the same issue, but in his case he was able
> to stay connected for a few hours without any issue.
> I wonder if the issue I am experiencing could be due to defective
> hardware (initially I excluded it since the same configuration is very
> stable under Windows). Is there any specific test that I can try to
> exclude hardware issues?
> 
> Bests,
> Giulio

You can swap the wifi cards in the two laptops. Make sure to unplug
the charger and the battery before working inside.