Problem with wireless network interface

[satura]

Hi, I'm experiencing some issues with my wifi interface not appearing and not being recognized when I boot up my machine, restart networking with systemd, or when I try to bring it up with ifup. I am running Debian 10 with KDE installed. This is the network interface as shown by lspci: 00:14.3 Network controller: Intel Corporation Wireless-AC 9560 [Jefferson Peak] (rev 10). The kernel module being used by it is iwlwifi, which is the correct one if I'm not mistaken. I used to occasionally get this issue, but it would somehow resolve itself after some time, seemingly without user intervention. The wifi option used to appear in the KDE network manager next to airplane mode, but now that is also gone.
My /etc/network/interfaces file looks like:

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# The loopback network interface
auto lo
iface lo inet loopback

# The wired network interface
auto enp1s0
iface enp1s0 inet dhcp

# The wireless network interface
auto wlp0s20f3
iface wlp0s20f3 inet dhcp

This is the output of $ systemctl status networking

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● networking.service - Raise network interfaces
   Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Mon 2021-02-08 16:33:26 CST; 10s ago
     Docs: man:interfaces(5)
  Process: 21425 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=1/FAILURE)
 Main PID: 21425 (code=exited, status=1/FAILURE)

Feb 08 16:33:25 user dhclient[21452]: than a configuration issue please read the section on submitti
Feb 08 16:33:25 user dhclient[21452]: bugs on either our web page at www.isc.org or in the README fi
Feb 08 16:33:25 user dhclient[21452]: before submitting a bug.  These pages explain the proper
Feb 08 16:33:25 user dhclient[21452]: process and the information we find helpful for debugging.
Feb 08 16:33:25 user dhclient[21452]: 
Feb 08 16:33:25 user dhclient[21452]: exiting.
Feb 08 16:33:26 user ifup[21425]: ifup: failed to bring up wlp0s20f3
Feb 08 16:33:26 user systemd[1]: networking.service: Main process exited, code=exited, status=1/FAIL
Feb 08 16:33:26 user systemd[1]: networking.service: Failed with result 'exit-code'.
Feb 08 16:33:26 user systemd[1]: Failed to start Raise network interfaces.

This is the output of $ ifup wlp0s20f3

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Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Cannot find device "wlp0s20f3"
Failed to get interface index: No such device

If you think you have received this message due to a bug rather
than a configuration issue please read the section on submitting
bugs on either our web page at www.isc.org or in the README file
before submitting a bug.  These pages explain the proper
process and the information we find helpful for debugging.

exiting.
ifup: failed to bring up wlp0s20f3

I'd appreciate any help I can get on this as these issues used to be intermittent, but now I have been unable to access the internet via wifi for two days.

[Bulkley]

Did you install firmware-iwlwifi from the non-free repository?

[satura]

Did you install firmware-iwlwifi from the non-free repository?

Yes. According to the system "firmware-iwlwifi is already the newest version (20190114-2)"

[Bulkley]

Is this a new install or has it been working?

Have you read this thread?

What does this tell you?

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# iwconfig

[satura]

Is this a new install or has it been working?

Have you read this thread?

What does this tell you?

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# iwconfig

I have read that and my hardware is supported. This is not a new install. I've been using this hardware with debian for about a year now, but in the past few months this issue has come up from time to time.

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# iwconfig

returns:

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lo        no wireless extensions.

enp1s0    no wireless extensions.

It doesn't even show my wireless interface there. I'm not sure what the issue could be. I'm under the impression that it is named correctly in accordance to the predictable naming scheme. The lspci command shows the network card under 00:14.3 which means the name should be wlp0s20f3 correct? This is because it is in bus 0, socket 0x14 (decimal 20), and function 3.

[Head_on_a_Stick]

An intermittent problem suggests hardware failure. Use a live ISO image to eliminate mis-configuration.

[satura]

An intermittent problem suggests hardware failure. Use a live ISO image to eliminate mis-configuration.

If this was due to hardware failure, would lspci still detect the hardware?

[satura]

The wifi worked again for some time, but it stopped working again. Upon booting, I get the following errors:

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[   21.200972] iwlwifi 0000:00:14.3: Microcode SW error detected. Restarting 0x0.
[   21.201054] iwlwifi 0000:00:14.3: Not valid error log pointer 0x00000000 for Init uCode
[   21.201174] iwlwifi 0000:00:14.3: SecBoot CPU1 Status: 0x3, CPU2 Status: 0x240f
[   21.201251] iwlwifi 0000:00:14.3: Failed to start INIT ucode: -5
[   21.218214] iwlwifi 0000:00:14.3: Failed to run INIT ucode: -5

I'd appreciate any help with with fixing this. I do have secure boot disabled, so I'm not sure what the "SecBoot" errors are about.

[Head_on_a_Stick]

If this was due to hardware failure, would lspci still detect the hardware?

That depends on the nature of the failure. For example I don't think a broken antenna would stop the card from showing up in lspci.

I do have secure boot disabled

Debian has been compatible with Secure Boot since buster was released as stable.

For your connection problems try some of the kernel parameters listed here: https://wiki.archlinux.org/index.php/Ne ... ss#iwlwifi