Bug#1008575: Wi-Fi works with loglevel=3 but not without

[Tomas Pospisek <tpo_deb@sourcepole.ch>]

I wrote:

> Wi-Fi stops working after upgrading from -12- to 
> linux-image-5.10.0-13-amd64 (iwlwifi: probe of 0000:00:14.3 failed with 
> error -110))

So in order to get more debug info, I set `loglevel=3` in grub in the 
kernel command line.

That changed two things:

* now while booting I get to see the line on screen:
  iwlwifi 0000:00:14.3: firmware: failed to load iwl-debug-yoyo.bin (-2)
  That wouldn't get displayed previously when booting without `loglevel=3`

* now Wi-Fi actually works!
  kernel logs say:
  Mar 29 09:03:29 enfi kernel: [    4.631274] iwlwifi 0000:00:14.3: firmware: direct-loading firmware iwlwifi-QuZ-a0-hr-b0-59.ucode
  Mar 29 09:03:29 enfi kernel: [    4.631282] iwlwifi 0000:00:14.3: api flags index 2 larger than supported by driver
  Mar 29 09:03:29 enfi kernel: [    4.631290] iwlwifi 0000:00:14.3: TLV_FW_FSEQ_VERSION: FSEQ Version: 65.3.35.22
  Mar 29 09:03:29 enfi kernel: [    4.631539] iwlwifi 0000:00:14.3: loaded firmware version 59.601f3a66.0 QuZ-a0-hr-b0-59.ucode op_mode iwlmvm
  Mar 29 09:03:29 enfi kernel: [    4.631551] iwlwifi 0000:00:14.3: firmware: failed to load iwl-debug-yoyo.bin (-2)
  [...]
  Mar 29 09:03:29 enfi kernel: [    4.893787] iwlwifi 0000:00:14.3: Detected Intel(R) Wi-Fi 6 AX201 160MHz, REV=0x354

Repeatedly switching back and forth between booting kernel ...-13 with or 
without `loglevel=3` will alternate between working and non-working Wi-Fi.
*t

On Mon, 28 Mar 2022, Debian Bug Tracking System wrote:

> Thank you for filing a new Bug report with Debian.
>
> You can follow progress on this Bug here: 1008575: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1008575.
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> 1008575: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1008575
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