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As I mentioned here my wireless connection is not working. After making some changes to the firmware according to the support of some community members I ended up with the following output:

sudo dmesg | grep iwlwifi outputs:

[    3.373741] iwlwifi 0000:00:14.3: enabling device (0000 -> 0002)
[    3.381121] iwlwifi: No config found for PCI dev 02f0/0000, rev=0x354, rfid=0x0
[    3.381223] iwlwifi: probe of 0000:00:14.3 failed with error -22

I noticed that the last numbers of the Subsystem entry changed according to the last time I ran lspci -kvnn | sed -n '/Network/,/^$/ p'. It now returns

00:14.3 Network controller [0280]: Intel Corporation Wireless-AC 9462 [8086:02f0]
    DeviceName: Onboard - Ethernet
    Subsystem: Intel Corporation Wireless-AC 9462 [8086:0000]
    Flags: bus master, fast devsel, latency 0, IRQ 16
    Memory at c431c000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: <access denied>
    Kernel modules: iwlwifi

Does anybody have a clue how I could proceed to get wireless connection again? I would also be willing to format my the whole system if necessary. However as I tried installing an 18.04 Ubuntu version alongside my 20.04 one already without any improvement I'm not sure if that helps...

EDIT (replying to @nobody comment)

dkms status

backport-iwlwifi, 8324: added
virtualbox, 6.1.26, 5.11.0-38-generic, x86_64: installed
virtualbox, 6.1.26, 5.14.14-051414-generic, x86_64: installed
virtualbox, 6.1.26, 5.4.0-89-generic, x86_64: installed

uname -r : 5.14.14-051414-generic

rfkill list

0: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

grep -i error /var/log/kern.log -> External file link Here there are definitely some alarming messages like

Oct 24 19:57:22 angelo-P15648 kernel: [14072.342831] iwlwifi 0000:00:14.3: Start IWL Error Log Dump:
Oct 24 19:57:22 angelo-P15648 kernel: [14072.342920] iwlwifi 0000:00:14.3: 0xE0000021 | FSEQ_ERROR_CODE
Oct 24 19:57:22 angelo-P15648 kernel: [14072.343325] iwlwifi 0000:00:14.3: Firmware error during reconfiguration - reprobe!
Oct 24 19:57:22 angelo-P15648 kernel: [14072.343674] iwlwifi 0000:00:14.3: FW error in SYNC CMD MAC_CONTEXT_CMD
Oct 24 19:57:22 angelo-P15648 kernel: [14072.345211] iwlwifi 0000:00:14.3: Hardware error detected. Restarting.

Edit 2 (replying to @chili555)

It is not a dual boot. Only systems installed are Ubuntu.

You assumed the kernel version correctly. uname -r outputs 5.14.14-051414-generic

dmesg | grep iwl outputs:

[    2.794034] iwlwifi 0000:00:14.3: enabling device (0000 -> 0002)
[    2.797944] iwlwifi: No config found for PCI dev 02f0/0000, rev=0x354, rfid=0x0
[    2.798042] iwlwifi: probe of 0000:00:14.3 failed with error -22

I removed backport from dkms tree using sudo dkms remove backport-iwlwifi/8324 --all

dkms status now returns

virtualbox, 6.1.26, 5.11.0-38-generic, x86_64: installed
virtualbox, 6.1.26, 5.14.14-051414-generic, x86_64: installed
virtualbox, 6.1.26, 5.4.0-89-generic, x86_64: installed

Edit 3 (replying to @chili555)

Testing with kernel version 5.4.0-89-generic

dmesg | grep iwl does not return anything...

dkms status returns

virtualbox, 6.1.26, 5.11.0-38-generic, x86_64: installed
virtualbox, 6.1.26, 5.14.14-051414-generic, x86_64: installed
virtualbox, 6.1.26, 5.4.0-89-generic, x86_64: installed
angelogro
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  • Have you tried to install backport-iwlwifi-dkms ? – nobody Oct 26 '21 at 18:04
  • @nobody It is installed (output: backport-iwlwifi-dkms is already the newest version (8324-0ubuntu3~20.04.4)) but I am not sure if it is 'active'. Do you know how to make sure the system is trying to 'use' it?

    To be honest: as I tried several approaches to solve the problem, I feel everything is tidy and I wonder if I can clean up or reset everything I installed during the last two days. Any idea on how to approach this?

     – angelogro Oct 26 '21 at 19:29
  • are you sure it is not a hardware issue? dkms status and uname -r please. Also rfkill list and grep -i error /var/log/kern.log – nobody Oct 26 '21 at 20:29
  • @nobody outputs can be found in the edited question – angelogro Oct 26 '21 at 20:46
  • backport-iwlwifiis not korrekt installed. It is added to dkms tree but not build nor installed in any kernel of yours. the firmwares that are not found are in package linux-firmware In my opinion the module iwlwifi crashes, because it 'thinks' somethiing wrong with the intel-microcode. but my knowledge for this is really restricted.I'm sorry maybe someone other can superiorly help than me. – nobody Oct 26 '21 at 21:23
  • dkms install backport-iwlwifi/8324 -k 5.14.14-051414-generic returns Error! The /var/lib/dkms/backport-iwlwifi/8324/5.14.14-051414-generic/x86_64/dkms.conf for module backport-iwlwifi includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch. This indicates that it should not be built. @nobody Thank you anyway. – angelogro Oct 26 '21 at 21:38
  • I don't believe that backport installs correctly for any kernel version above 5.4. I suggest that you remove it. Reboot into, I assume, kernel version 5.14.14 and show me: sudo dmesg | grep iwl If this is a dual boot with Windows, please disable Fast Boot. – chili555 Oct 26 '21 at 22:01
  • @chili555 I updated the question (see Edit 2). – angelogro Oct 28 '21 at 08:04
  • @chili555 Maybe this line i915 0000:00:02.0: [drm] *ERROR* Atomic update failure on pipe A (start=54947 end=54948) time 185 us, min 1073, max 1079, scanline start 1069, end 1080 of the error log might be interesting. It occurred ~3 hours before the iwlwifi driver first's error occurred. Just to remind you: Up until 4 days ago I never had (visible) problems with my wifi. – angelogro Oct 28 '21 at 11:32
  • If you interrupt the boot process at the GRUB menu and boot into the earliest kernel version that you have, does the problem remain? Perhaps it is 5.14.14 that is the issue. – chili555 Oct 28 '21 at 13:49
  • @chili555 I will try it. However, have in mind that I only installed 5.14.14 in the process of tackling the problem with the iwlwifi. – angelogro Oct 28 '21 at 15:46
  • "dmesg | grep iwl does not return anything..." How about: sudo modprobe iwlwifi && sudo dmesg | grep iwl Modprobe may produce an error that leads us to the solution. – chili555 Oct 29 '21 at 14:40
  • @chili555 sudo modprobe iwlwifi && sudo dmesg | grep iwl returns no output. – angelogro Oct 30 '21 at 08:42
  • Have you an older bionic iso for a live session? for testing? – nobody Oct 30 '21 at 10:31
  • Are you still working to solve this problem? I have a new idea (udev rule) and need a tester! Please reply. – chili555 Jan 06 '22 at 15:40
  • maybe he is not but I would have the exact same problem if there is still need for a tester ;) – relief.melone Jan 13 '23 at 12:06
  • @relief.melone Please start a new question. I’ll be happy to help. – chili555 Jan 13 '23 at 13:13
  • Thank you for the quick reply. I was able to sort it out by updating kernel from 5.15-5.19. – relief.melone Jan 14 '23 at 14:23

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