[Solved] iwlwifi deleted from kernel 4.15.0-20-generic x86_64?

[hrmcrm]

I tested kernel 4.15.0-20-generic x86_64 and had no wifi. It's OK in kernel 4.15.0-15-generic x86_64.
With 14.15.0-15:

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howard@X201LM183KDE64 ~ $ inxi -Fxz
System:    Host: X201LM183KDE64 Kernel: 4.15.0-15-generic x86_64 (64 bit gcc: 5.4.0)
           Desktop: KDE Plasma 5.8.9 (Qt 5.6.1) Distro: Linux Mint 18.3 Sylvia
Machine:   System: LENOVO (portable) product: 32492FU v: ThinkPad X201
           Mobo: LENOVO model: 32492FU Bios: LENOVO v: 6QET70WW (1.40 ) date: 10/11/2012
CPU:       Dual core Intel Core i5 M 540 (-HT-MCP-) cache: 3072 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 10107
           clock speeds: max: 2534 MHz 1: 1444 MHz 2: 1395 MHz 3: 1390 MHz 4: 1317 MHz
Graphics:  Card: Intel Core Processor Integrated Graphics Controller bus-ID: 00:02.0
           Display Server: X.Org 1.18.4 drivers: intel (unloaded: fbdev,vesa) Resolution: 1280x800@60.00hz
           GLX Renderer: Mesa DRI Intel Ironlake Mobile GLX Version: 2.1 Mesa 17.2.8 Direct Rendering: Yes
Audio:     Card Intel 5 Series/3400 Series High Definition Audio driver: snd_hda_intel bus-ID: 00:1b.0
           Sound: Advanced Linux Sound Architecture v: k4.15.0-15-generic
Network:   Card-1: Intel 82577LM Gigabit Network Connection driver: e1000e v: 3.2.6-k port: 1820 bus-ID: 00:19.0
           IF: enp0s25 state: down mac: <filter>
           Card-2: Intel Centrino Advanced-N 6200 driver: iwlwifi bus-ID: 02:00.0
           IF: wlp2s0 state: up mac: <filter>
Drives:    HDD Total Size: 320.1GB (16.3% used) ID-1: /dev/sda model: ST9320423AS size: 320.1GB
Partition: ID-1: / size: 20G used: 12G (62%) fs: ext4 dev: /dev/sda5
           ID-2: /home size: 9.8G used: 4.2G (46%) fs: ext4 dev: /dev/sda6
           ID-3: swap-1 size: 8.05GB used: 0.00GB (0%) fs: swap dev: /dev/sda8
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 46.0C mobo: 0.0C
           Fan Speeds (in rpm): cpu: 1954
Info:      Processes: 198 Uptime: 5 min Memory: 483.3/3743.1MB Init: systemd runlevel: 5 Gcc sys: 5.4.0
           Client: Shell (bash 4.3.481) inxi: 2.2.35                                                                                                         
howard@X201LM183KDE64 ~ $

With 14.15.0-20:

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howard@X201LM183KDE64 ~ $ inxi -Fxz
System:    Host: X201LM183KDE64 Kernel: 4.15.0-20-generic x86_64 (64 bit gcc: 5.4.0)
           Desktop: KDE Plasma 5.8.9 (Qt 5.6.1) Distro: Linux Mint 18.3 Sylvia
Machine:   System: LENOVO (portable) product: 32492FU v: ThinkPad X201
           Mobo: LENOVO model: 32492FU Bios: LENOVO v: 6QET70WW (1.40 ) date: 10/11/2012
CPU:       Dual core Intel Core i5 M 540 (-HT-MCP-) cache: 3072 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 10107
           clock speeds: max: 2534 MHz 1: 1251 MHz 2: 1417 MHz 3: 1403 MHz 4: 1356 MHz
Graphics:  Card: Intel Core Processor Integrated Graphics Controller bus-ID: 00:02.0
           Display Server: X.Org 1.18.4 drivers: fbdev,intel (unloaded: vesa) Resolution: 1280x800@76.00hz
           GLX Renderer: llvmpipe (LLVM 5.0, 128 bits) GLX Version: 3.0 Mesa 17.2.8 Direct Rendering: Yes
Audio:     Card Intel 5 Series/3400 Series High Definition Audio bus-ID: 00:1b.0
Network:   Card-1: Intel 82577LM Gigabit Network Connection driver: e1000e v: 3.2.6-k port: 1820 bus-ID: 00:19.0
           IF: enp0s25 state: down mac: <filter>
           Card-2: Intel Centrino Advanced-N 6200 bus-ID: 02:00.0
           IF: N/A state: N/A mac: N/A
Drives:    HDD Total Size: 320.1GB (16.3% used) ID-1: /dev/sda model: ST9320423AS size: 320.1GB
Partition: ID-1: / size: 20G used: 12G (62%) fs: ext4 dev: /dev/sda5
           ID-2: /home size: 9.8G used: 4.2G (46%) fs: ext4 dev: /dev/sda6
           ID-3: swap-1 size: 8.05GB used: 0.00GB (0%) fs: swap dev: /dev/sda8
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 53.0C mobo: N/A
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 177 Uptime: 1 min Memory: 446.0/3743.1MB Init: systemd runlevel: 5 Gcc sys: 5.4.0
           Client: Shell (bash 4.3.481) inxi: 2.2.35 
howard@X201LM183KDE64 ~ $

Also with 14.15.0-20

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howard@X201LM183KDE64 ~ $ modprobe iwlwifi
modprobe: ERROR: ../libkmod/libkmod-module.c:832 kmod_module_insert_module() could not find module by name='iwlwifi'
modprobe: ERROR: could not insert 'iwlwifi': Unknown symbol in module, or unknown parameter (see dmesg)
howard@X201LM183KDE64 ~ $

So is iwlwifi gone for good, or is this a bug that needs reporting?
Thanks,

[JeremyB]

No, iwlwifi is not gone. There is some bug with the changes Ubuntu made with the 4.15.0-20 kernel. I suggest using the LTS 4.4 kernel or the 4.13 kernel that will be supported until August until this issue is sorted
or you could try

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sudo apt-get install linux-modules-extra-4.15.0-20-generic

Reboot

[hrmcrm]

Always interested in learning something new, while running 14.15.0-15 I did

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sudo apt-get install linux-modules-extra-4.15.0-20-generic

rebooted into 14.15.0-20, and voilà, wifi.

I do run the LTS 4.4 kernel quite a bit. It works flawlessly.

Thanks, Jeremy.

[karlchen]

Analysis and solution: Read Clem's posts starting here: Re: Trouble with 4.15.0-20 kernel