I have a lenovo thinkpad E550 that has had kubuntu installed starting with 18.04, now updated to 20.04, I never had problems with wifi until last kernel update.
If I boot with 5.4.0-33.37 the wireless connection acts normally, it's mostly stable and I have no major issues.
If I boot with 5.4.0-37.41 there is a message like this and the wireless interface is not activated:
[ 16.227170] kernel: iwlwifi 0000:04:00.0: enabling device (0000 -> 0002)
[ 16.227328] kernel: iwlwifi 0000:04:00.0: HW_REV=0xFFFFFFFF, PCI issues?
[ 16.275802] kernel: iwlwifi: probe of 0000:04:00.0 failed with error -5
There are similar issue with previous releases, but none seem to have fixed the problem, some of the more informatives (apparently it's either a kernel issue fixed with kernel 5.6 or a firmware loaded incorrectly):
- https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1867026
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1865962
System specifications:
System: Host: pc Kernel: 5.4.0-33-generic x86_64 bits: 64 Console: tty 0
Distro: Ubuntu 20.04 LTS (Focal Fossa)
Machine: Type: Laptop System: LENOVO product: 20DF004USP v: ThinkPad E550 serial: ---
Mobo: LENOVO model: 20DF004USP v: SDK0E50510 WIN serial: ---
UEFI [Legacy]: LENOVO v: J5ET54WW (1.25 ) date: 07/18/2016
CPU: Topology: Dual Core model: Intel Core i7-5500U bits: 64 type: MT MCP L2 cache: 4096 KiB
Speed: 798 MHz min/max: 500/3000 MHz Core speeds (MHz): 1: 798 2: 798 3: 798 4: 798
Network: Device-1: Intel Ethernet I218-V driver: e1000e
IF: enp0s25 state: down mac: 68:f7:28:5f:d7:27
Device-2: Intel Wireless 3160 driver: iwlwifi
IF: wlp4s0 state: up mac: d0:7e:35:84:92:57
IF-ID-1: lxcbr0 state: down mac: 00:16:3e:00:00:00
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: jjuvan 2797 F.... pulseaudio
/dev/snd/pcmC1D0p: jjuvan 2797 F...m pulseaudio
/dev/snd/controlC0: jjuvan 2797 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: KDE
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2018-11-05 (591 days ago)
InstallationMedia: Ubuntu-Server 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
MachineType: LENOVO 20DF004USP
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-33-generic root=UUID=a8d80ba4-a0b8-4f71-9b3c-597f8c49f7f9 ro
ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
RelatedPackageVersions:
linux-restricted-modules-5.4.0-33-generic N/A
linux-backports-modules-5.4.0-33-generic N/A
linux-firmware 1.187
Tags: focal
Uname: Linux 5.4.0-33-generic x86_64
UpgradeStatus: Upgraded to focal on 2020-05-11 (38 days ago)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 07/18/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: J5ET54WW (1.25 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20DF004USP
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50510 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrJ5ET54WW(1.25):bd07/18/2016:svnLENOVO:pn20DF004USP:pvrThinkPadE550:rvnLENOVO:rn20DF004USP:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad E550
dmi.product.name: 20DF004USP
dmi.product.sku: LENOVO_MT_20DF_BU_Think_FM_ThinkPad E550
dmi.product.version: ThinkPad E550
dmi.sys.vendor: LENOVO
This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1884025
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.