Intel Wireless-AC 9462 [8086:02f0] Subsystem [8086:42a4]: After the upgrade of 19.10 on 2020-02-18, wifi does not exist

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There is an error appearing in journalctl :
* Before the error
kernel: x86_pkg_temp_thermal intel_powerclamp uvcvideo cdc_mbim iwlmvm videobuf2_vmalloc coretemp dell
...
kernel: iwlwifi 0000:00:14.3: enabling device (0000 -> 0002)
...
kernel: iwlwifi 0000:00:14.3: TLV_FW_FSEQ_VERSION: FSEQ Version: 43.2.23.17
kernel: iwlwifi 0000:00:14.3: loaded firmware version 48.4fa0041f.0 op_mode iwlmvm
...
kernel: iwlwifi 0000:00:14.3: Detected Intel(R) Wireless-AC 9462, REV=0x354
...

* The error:
kernel: iwlwifi 0000:00:14.3: Start IWL Error Log Dump:
kernel: iwlwifi 0000:00:14.3: Status: 0x00000000, count: 734187146
kernel: iwlwifi 0000:00:14.3: Loaded firmware version: 48.4fa0041f.0
kernel: iwlwifi 0000:00:14.3: 0x5EB1A45F | ADVANCED_SYSASSERT
kernel: iwlwifi 0000:00:14.3: 0x537B377D | trm_hw_status0
kernel: iwlwifi 0000:00:14.3: 0x16531F5B | trm_hw_status1
kernel: iwlwifi 0000:00:14.3: 0x789E583D | branchlink2
kernel: iwlwifi 0000:00:14.3: 0xF80107FF | interruptlink1
kernel: iwlwifi 0000:00:14.3: 0xE662F7E1 | interruptlink2
kernel: iwlwifi 0000:00:14.3: 0x016292A7 | data1
kernel: iwlwifi 0000:00:14.3: 0x0666F313 | data2
kernel: iwlwifi 0000:00:14.3: 0x57FCBE23 | data3
kernel: iwlwifi 0000:00:14.3: 0x79952915 | beacon time
kernel: iwlwifi 0000:00:14.3: 0x4F1735DD | tsf low
kernel: iwlwifi 0000:00:14.3: 0x7410F667 | tsf hi
kernel: iwlwifi 0000:00:14.3: 0x7E4198AA | time gp1
kernel: iwlwifi 0000:00:14.3: 0xA12F19D9 | time gp2
kernel: iwlwifi 0000:00:14.3: 0xCF52900E | uCode revision type
kernel: iwlwifi 0000:00:14.3: 0xE3D9AD8C | uCode version major
kernel: iwlwifi 0000:00:14.3: 0x13FA8BC4 | uCode version minor
kernel: iwlwifi 0000:00:14.3: 0xD5D1171F | hw version
kernel: iwlwifi 0000:00:14.3: 0x24BFBE2A | board version
kernel: iwlwifi 0000:00:14.3: 0x908515E5 | hcmd
kernel: iwlwifi 0000:00:14.3: 0x45691B81 | isr0
kernel: iwlwifi 0000:00:14.3: 0xB729E7C0 | isr1
kernel: iwlwifi 0000:00:14.3: 0xF0A4082C | isr2
kernel: iwlwifi 0000:00:14.3: 0xE3FDC5D5 | isr3
kernel: iwlwifi 0000:00:14.3: 0x51CF9BDA | isr4
kernel: iwlwifi 0000:00:14.3: 0xD5A042EC | last cmd Id
kernel: iwlwifi 0000:00:14.3: 0x420A9D1A | wait_event
kernel: iwlwifi 0000:00:14.3: 0xB29859DA | l2p_control
kernel: iwlwifi 0000:00:14.3: 0x988FAB50 | l2p_duration
kernel: iwlwifi 0000:00:14.3: 0x7D50CEA1 | l2p_mhvalid
kernel: iwlwifi 0000:00:14.3: 0x92CB53FD | l2p_addr_match
kernel: iwlwifi 0000:00:14.3: 0xA8011242 | lmpm_pmg_sel
kernel: iwlwifi 0000:00:14.3: 0x37EED3C2 | timestamp
kernel: iwlwifi 0000:00:14.3: 0x3E852D44 | flow_handler
kernel: iwlwifi 0000:00:14.3: Start IWL Error Log Dump:
kernel: iwlwifi 0000:00:14.3: Status: 0x00000000, count: 7
kernel: iwlwifi 0000:00:14.3: 0x201013F1 | ADVANCED_SYSASSERT
kernel: iwlwifi 0000:00:14.3: 0x00000000 | umac branchlink1
kernel: iwlwifi 0000:00:14.3: 0xC008CF5C | umac branchlink2
kernel: iwlwifi 0000:00:14.3: 0x00000000 | umac interruptlink1
kernel: iwlwifi 0000:00:14.3: 0x00000000 | umac interruptlink2
kernel: iwlwifi 0000:00:14.3: 0x00000003 | umac data1
kernel: iwlwifi 0000:00:14.3: 0x20000302 | umac data2
kernel: iwlwifi 0000:00:14.3: 0x00000201 | umac data3
kernel: iwlwifi 0000:00:14.3: 0x00000030 | umac major
kernel: iwlwifi 0000:0...

What's the last kernel version still works?

In my case 5.3.0.29

And from which kernel it starts to break?

In my case 5.3.0.40. I do not if there has been more available kernels in between.

Affected user here

Lenovo Ideapad S 530.

NAME="Ubuntu"
VERSION="18.04.4 LTS (Bionic Beaver)"

Solving the problem temporarily by booting under
5.3.0-28-generic,

Until 5.3.0-40 will have a patch released.

Let me know if I can provide logs to help with the process, or if there is a better fix available.

Can you please test 5.3.0-42.34 from proposed?

I am sorry, How can I install that version? is proposed a repository?

https://wiki.ubuntu.com/Testing/EnableProposed

Thank you. I have installed linux-image-5.3.0-42-generic, but the computer gets stuck just afer loading initial ramdisk.

Is there a way to install the iwlwifi drivers again to enable wifi? this is the only source of internet.

I have also experienced the same problem after installing 'ubuntu-19.10-desktop-amd64' on a new Dell Inspiron 5491 to dual boot with the default Windows 10 that comes with the laptop. Initially I tried to install 'ubuntu-18.04.4-desktop-amd64' during each installation the installer recognized and used the WiFi each time, however, after updating Ubuntu and rebooting, this resulted in the "No WiFi Adapter Found" problem. Th same problem I am currently experiencing on ubuntu-19.10. However, for ubuntu19.10 since I requested to get updates to the os during installation, the update may have caused the above bug with exactly the same outputs show about.

I think it's commit db5cce1afc8d ("Revert "iwlwifi: assign directly to iwl_trans->cfg in QuZ detection"") introduced in bug 1860816.

@kth, please try install backport-iwlwifi-dkms from Focal: https://packages.ubuntu.com/focal/backport-iwlwifi-dkms

could you also test kernel in https://people.canonical.com/~acelan/bugs/lp1865829/ ? Install all to deb files. You should have DKMS package removed/deactivated while testing it.

These packages work, at least the wifi.

Well, is this the same problem I've described here today?: https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1867026

I'm not sure how to test this solution (how to "DKMS package removed/deactivated while testing it"?)

@Tiago, since you're on Bionic/Eoan, please go on to install kernel packages from https://people.canonical.com/~acelan/bugs/lp1865829/ directly and see if that also works for you.

Mark duplicate of bug 1865962 according to comment #16.

I got similar issue on Thinkpad X1 Yoga 4th:
https://askubuntu.com/questions/1216299/update-to-kernel-5-3-0-40-no-wifi-ubuntu-19-10-intel-ac-9560

And I'm glad to verify solutions if any, just send me a mail via <email address hidden>.

Now I have to boot to Ubuntu 19.10 with kernel 5.3.0-18 to use the WiFi function.

Thanks~

Seems to affect any new Dell inspiron sold in Brazil. In particular, both my 15" and my wife 14" do not have wifi with standard 19.10 kernel!

Same problem on ASUS VivoBook S14, upgraded from 5.3.0-18 to -42. Now have to rollback to use WiFi.

Same or very similar problem. I've tried installing older kernels all the way back to $ uname -r
4.20.17-042017-lowlatency and intel wifi is still non-functional.

Got a new zenbook UX431F and no wifi despite having a usually well supported intel wifi.
The PCI id is 8086 02f0. No clear if this is a AC9462, AC9560, 22000. The relation between the commercial name and the actual hardware remains mysterious to me.

I eventually found a workaround. The important bit for you may be that it seems that the driver shipped with the standard bionic kernel 5.3.0-46 loads the wrong firmware blob. It loads "iwlwifi-Qu-b0-jf-b0-48.ucode" which crashes quickly, as seen in dmesg. Here is why I believe it should load "iwlwifi-QuZ-a0-jf-b0-48.ucode":

* The backport-iwlwifi-dkms, version 7906 from https://packages.ubuntu.com/search?keywords=backport-iwlwifi-dkms seems in fact older than the driver found in kernel 5.3.0-46. I have to dkms install --force to use it. It loads firmare "/lib/firmware/iwlwifi-QuZ-a0-jf-b0-48.ucode" and does not crash. I can see the available ssids in network manager. But dmesg shows an error setting up "wep" and it seems unable to stay connected to my secure network.

* Then I tried version 8324 from https://launchpad.net/~canonical-hwe-team/+archive/ubuntu/backport-iwlwifi. This one also loads "/lib/firmware/iwlwifi-QuZ-a0-jf-b0-48.ucode" and all works fine! Too bad it took me several hours to find it.

Anyway, none of the drivers that load "/lib/firmware/iwlwifi-QuZ-a0-jf-b0-48.ucode" show a firmware crash in the intel chip. The shipped driver loads "iwlwifi-Qu-b0-jf-b0-48.ucode" and crashes, resulting in no wifi card being registered.

In case this helps.

- Leon