[solved] iwlwifi not loaded anymore on boot

[undersound]

Hi,

Wifi stopped working suddenly. When I power on and boot no wifi interface is detected.
After logging in and manually running modprobe iwlwifi wifi comes up again.

Any ideas are appreciated.

Code: Select all

System:    Host: myhost Kernel: 4.15.0-177-generic x86_64 bits: 64 compiler: gcc v: 7.5.0 Desktop: Cinnamon 4.4.8 
           Distro: Linux Mint 19.3 Tricia base: Ubuntu 18.04 bionic 
Machine:   Type: Laptop System: Dell product: Precision 5530 v: N/A serial: <filter> 
           Mobo: Dell model: 0NFGCT v: A00 serial: <filter> UEFI: Dell v: 1.17.1 date: 07/09/2020 
Battery:   ID-1: BAT0 charge: 10.6 Wh condition: 80.3/97.0 Wh (83%) model: SMP DELL GPM0365 status: Discharging 
Memory:    RAM: total: 15.29 GiB used: 3.01 GiB (19.7%) 
           RAM Report: permissions: Unable to run dmidecode. Root privileges required. 
CPU:       Topology: 6-Core model: Intel Core i7-8850H bits: 64 type: MT MCP arch: Kaby Lake rev: A 
           L2 cache: 9216 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 62399 
           Speed: 800 MHz min/max: 800/2600 MHz Core speeds (MHz): 1: 800 2: 800 3: 800 4: 800 5: 800 6: 800 7: 800 
           8: 800 9: 800 10: 800 11: 800 12: 799 
Graphics:  Device-1: Intel vendor: Dell driver: i915 v: kernel bus ID: 00:02.0 
           Device-2: NVIDIA GP107GLM [Quadro P1000 Mobile] vendor: Dell driver: N/A bus ID: 01:00.0 
           Display: x11 server: X.Org 1.19.6 driver: modesetting unloaded: fbdev,vesa resolution: 1600x900~60Hz 
           OpenGL: renderer: Mesa DRI Intel UHD Graphics 630 (CFL GT2) v: 4.6 Mesa 20.0.8 direct render: Yes 
Audio:     Device-1: Intel Cannon Lake PCH cAVS vendor: Dell driver: N/A bus ID: 00:1f.3 
           Sound Server: ALSA v: k4.15.0-177-generic 
Network:   Device-1: Intel Wireless-AC 9260 driver: iwlwifi v: kernel port: 3000 bus ID: 3b:00.0 
           IF: wlp59s0 state: up mac: <filter> 

[karlchen]

Hello, undersound.

Did the wifi adapter work in the past, e.g. when your system still had a previous kernel like e.g. 4.15.0-176?
Does the wifi adapter work if you boot a previous kernel like e.g. 4.15.0-176?

Regards,
Karl

[undersound]

Hello, undersound.

Did the wifi adapter work in the past, e.g. when your system still had a previous kernel like e.g. 4.15.0-176?
Does the wifi adapter work if you boot a previous kernel like e.g. 4.15.0-176?

Regards,
Karl

Hi Karl,

Thanks for your suggestion. I loaded with the previous kernel and it works! What's the best way to proceed now?
I would prefer loading this kernel by default for now.

Greets
undersound

[karlchen]

Hello, undersound.

It is good that booting to the previous kernel 4.15.0-176 resolves the wifi issue.

I would prefer loading this kernel by default for now.

While your system is running on kernel 4.15.0-176, launch Update Manager, go to View => Linux Kernel. Select kernel 4.15.0-177 and click on [Remove]. This will uninstall kernel 4.15.0-177.
As a consequence K4.15.0-176 will be on top of the Grub menu again and will be booted automatically.

Update Manager will offer kernel 4.15.0-177 again as an available kernel update to you. Mark it and select to blacklist it, so that it will be no longer listed and so that you will not re-install it by accident potentially.

If you are lucky, the underlying bug(s) in K4.15.0-177 will be resolved in K4.15.0-180.
There seem to be a number of bugs or regressions in K4.15.0-177. In a similar thread I found a minimum of 3 Ubuntu Launchpad bug reports about kernel 4.15.0-177. Just for our reference, in case you are interested: > here <. Else ignore the linked post and the Launchpad bug reports.

Regards,
Karl
--
P.S.:
The next kernel after K4.15.0-177, which seems to cause various kinds of problems depending on the specific hardware, is K4.15.0-180, not 4.145.0-178 as I had wildly guessed. Plus K4.15.0-180 may not resolve the problems introduced in K4.15.0-177 at all, it seems. Cf. > that post <.

[undersound]

Hey Kariachen,

Thanks for the information on the kernel issues and the clear instruction on how to set a default.

Greets
Undersound