Comment 0 for bug 1913945

Since this laptop runs the 5.8 kernel, the WiFi adapter (an Intel Wireless 8260) does not work anymore. It does not show up in "ip a l", and "lshw -C network" shows the following ("UNCLAIMED" stands out):

$ sudo lshw -C network
[sudo] password for chef:
  *-network UNCLAIMED
       description: Network controller
       product: Wireless 8260
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       version: 3a
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress cap_list
       configuration: latency=0
       resources: memory:e4100000-e4101fff
  *-network
       description: Ethernet interface
       product: Ethernet Connection (2) I219-LM
       vendor: Intel Corporation
       physical id: 1f.6
       bus info: pci@0000:00:1f.6
       logical name: enp0s31f6
       version: 31
       serial: <snip>
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=0.8-4 ip=192.168.178.28 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
       resources: irq:125 memory:e4300000-e431ffff

When this laptop was running the 5.4 kernel, the wireless interface was working fine. It seems as if the iwlwifi driver does not attach anymore. When running the 5.8 kernel, "dmesg | grep iwlwifi" returns 0 lines, while running on the 5.4 kernel yields the following:

Jan 31 14:48:11 zbook kernel: [ 24.613260] iwlwifi 0000:02:00.0: enabling device (0000 -> 0002)
Jan 31 14:48:11 zbook kernel: [ 24.635261] iwlwifi 0000:02:00.0: Found debug destination: EXTERNAL_DRAM
Jan 31 14:48:11 zbook kernel: [ 24.635263] iwlwifi 0000:02:00.0: Found debug configuration: 0
Jan 31 14:48:11 zbook kernel: [ 24.635790] iwlwifi 0000:02:00.0: loaded firmware version 36.77d01142.0 op_mode iwlmvm
Jan 31 14:48:11 zbook kernel: [ 24.746604] iwlwifi 0000:02:00.0: Detected Intel(R) Dual Band Wireless AC 8260, REV=0x208
Jan 31 14:48:11 zbook kernel: [ 24.753815] iwlwifi 0000:02:00.0: Applying debug destination EXTERNAL_DRAM
Jan 31 14:48:11 zbook kernel: [ 24.754115] iwlwifi 0000:02:00.0: Allocated 0x00400000 bytes for firmware monitor.
Jan 31 14:48:11 zbook kernel: [ 24.824059] iwlwifi 0000:02:00.0: base HW address: <snip>
Jan 31 14:48:11 zbook kernel: [ 24.948350] iwlwifi 0000:02:00.0 wlp2s0: renamed from wlan0
Jan 31 14:48:11 zbook kernel: [ 26.458364] iwlwifi 0000:02:00.0: Applying debug destination EXTERNAL_DRAM
Jan 31 14:48:11 zbook kernel: [ 26.607194] iwlwifi 0000:02:00.0: Applying debug destination EXTERNAL_DRAM
Jan 31 14:48:12 zbook kernel: [ 26.686949] iwlwifi 0000:02:00.0: FW already configured (0) - re-configuring

$ lsb_release -rd
Description: Ubuntu 20.04.2 LTS
Release: 20.04
$ apt-cache policy linux-image-generic-hwe-20.04
linux-image-generic-hwe-20.04:
  Installed: (none)
  Candidate: 5.8.0.41.46~20.04.27
  Version table:
     5.8.0.41.46~20.04.27 500
        500 http://nl.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
     5.4.0.26.32 500
        500 http://nl.archive.ubuntu.com/ubuntu focal/main amd64 Packages
$ uname -a
Linux zbook 5.8.0-41-generic #46~20.04.1-Ubuntu SMP Mon Jan 18 17:52:23 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.8.0-41-generic 5.8.0-41.46~20.04.1
ProcVersionSignature: Ubuntu 5.8.0-41.46~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-41-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Sun Jan 31 15:34:20 2021
InstallationDate: Installed on 2020-09-12 (141 days ago)
InstallationMedia: Xubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: linux-signed-hwe-5.8
UpgradeStatus: No upgrade log present (probably fresh install)