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Bug#1026906: /lib/firmware/iwlwifi-cc-a0-72.ucode: "Microcode SW error detected" after idle for a while and breaks wifi

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On Friday, 23 December 2022 18:40:32 CET Yuxuan Wang wrote:
> Package: firmware-iwlwifi
> Version: 20221109-4
> 
> With firmware iwlwifi-cc-a0-72.ucode, the wifi chip would throw "Microcode
> SW error detected" after the system is idle for a while. After wakig up the
> system, the wifi would appears to be connected (in NetworkManager), but
> pinging the router will give "Destination Host Unreachable", and I have to
> turn wifi off and one again in NetworkManager to fix it.
> 
> This is the kernel log when the error happens:
> ...
> (delay=0ms). Dec 20 16:00:14 perch kernel: ieee80211 phy0: Hardware restart
> was requested
> 
> The hardware info according to `lspci -nn -d ::280` is:
> 
>     3b:00.0 Network controller [0280]: Intel Corporation Wi-Fi 6 AX200
> [8086:2723] (rev 1a)
> 
> I tried to downgrade it, via:
> 
>     mv /lib/firmware/iwlwifi-cc-a0-72.ucode
> /lib/firmware/iwlwifi-cc-a0-72.ucode.backup
> 
> And then reload the kernel models, which loaded 71 instead, but that still
> has a similar issue: instead of "Destination Host Unreachable", pinging the
> router gives me super high latency (in seconds instead of milliseconds) and
> the network is almost unusable, and I have to turn wifi off and on again in
> NetworkManager to fix it. The kernel log for 71 is:
> 
> I have to downgrade again (from 71 to 63, there's no version in between) to
> fix the issue.

So to summarize: It works with 63, but it fails with 71 or 72? And in order to 
make it work, you have to (actively) remove the 71 and 72 versions?

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Bug#1026906: /lib/firmware/iwlwifi-cc-a0-72.ucode: "Microcode SW error detected" after idle for a while and breaks wifi Diederik de Haas <didi.debian@cknow.org> - 2023-12-20 00:10 +0100
  Bug#1026906: /lib/firmware/iwlwifi-cc-a0-72.ucode: "Microcode SW error detected" after idle for a while and breaks wifi Yuxuan Wang <fishywang@gmail.com> - 2023-12-20 00:30 +0100

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