No, how can I try another one?
You probably have linux package as the kernel. Simply add the LTS kernel:
sudo pacman --needed -S linux-lts linux-lts-headers
and reboot to the LTS kernel.
I’d recommend keeping the LTS kernel even if it wouldn’t help, because it is a good fallback after major linux kernel changes (that is in fact coming soon).
Ok! I’m trying right now. Just the time for a quick clonezilla backup 
Take your time, no hurry.
Backup is always a great idea! 
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Done… Wifi stopped working completely 
Clonezilla backup restored. I’ve found that if I get closer to the router, the speed increases, but only on the 2.4 GHz line. I got 70mb in 2.4GHz and 3.5 mb in 5.0GHz (with 20mb upload…).
Just a thought, have you tried rebooting the router?
Also, check that there’s not a bandwidth limiter or some other QoS active on there.
Yes. Nothing. 
Are you able to try disabling the n mode directly in the router?
You could also try changing what i gave you before first to the following.
sudo nano /etc/modprobe.d/iwlwifi.conf
Add
options iwlwifi 11n_disable=8 swcrypto=1
You could also try setting the power saving setting.
sudo nano /etc/modprobe.d/iwlwifi.conf
add
options iwlwifi power_save=1
Sadly no.
Done. Nothing.
Done. Nothing.
This is a mystery 
Update: tried a fresh installation, same problem.
So did you try this from the archwiki?
Edit file /etc/modprobe.d/iwlwifi.conf:
options iwlwifi 11n_disable=1 swcrypto=1
and reboot?
Or if that doesn’t help, disable power saving of the wifi?
I’ve tried both of them. Nothing.
I’ve also tried a fresh install; in live environment it was all ok, after installation… Same problem. It is incredible.
Very strange. I guess we need some logs.
You could use the eos-log-tool in both live USB and the installed system.
Probably the first log, journalctl -b -0, is good enough for both of the systems.
This is my sistem’s log
dic 15 11:06:41 Raoh1990-MSI kernel: microcode: microcode updated early to revi>
dic 15 11:06:41 Raoh1990-MSI kernel: Linux version 5.9.14-arch1-1 (linux@archli>
dic 15 11:06:41 Raoh1990-MSI kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-lin>
dic 15 11:06:41 Raoh1990-MSI kernel: KERNEL supported cpus:
dic 15 11:06:41 Raoh1990-MSI kernel: Intel GenuineIntel
dic 15 11:06:41 Raoh1990-MSI kernel: AMD AuthenticAMD
dic 15 11:06:41 Raoh1990-MSI kernel: Hygon HygonGenuine
dic 15 11:06:41 Raoh1990-MSI kernel: Centaur CentaurHauls
dic 15 11:06:41 Raoh1990-MSI kernel: zhaoxin Shanghai
dic 15 11:06:41 Raoh1990-MSI kernel: x86/fpu: Supporting XSAVE feature 0x001: '>
dic 15 11:06:41 Raoh1990-MSI kernel: x86/fpu: Supporting XSAVE feature 0x002: '>
dic 15 11:06:41 Raoh1990-MSI kernel: x86/fpu: Supporting XSAVE feature 0x004: '>
dic 15 11:06:41 Raoh1990-MSI kernel: x86/fpu: Supporting XSAVE feature 0x008: '>
dic 15 11:06:41 Raoh1990-MSI kernel: x86/fpu: Supporting XSAVE feature 0x010: '>
dic 15 11:06:41 Raoh1990-MSI kernel: x86/fpu: xstate_offset[2]: 576, xstate_si>
dic 15 11:06:41 Raoh1990-MSI kernel: x86/fpu: xstate_offset[3]: 832, xstate_si>
dic 15 11:06:41 Raoh1990-MSI kernel: x86/fpu: xstate_offset[4]: 896, xstate_si>
dic 15 11:06:41 Raoh1990-MSI kernel: x86/fpu: Enabled xstate features 0x1f, con>
dic 15 11:06:41 Raoh1990-MSI kernel: BIOS-provided physical RAM map:
dic 15 11:06:41 Raoh1990-MSI kernel: BIOS-e820: [mem 0x0000000000000000-0x00000>
dic 15 11:06:41 Raoh1990-MSI kernel: BIOS-e820: [mem 0x000000000009ec00-0x00000>
dic 15 11:06:41 Raoh1990-MSI kernel: BIOS-e820: [mem 0x00000000000e0000-0x00000>
lines 1-23~~~The full log please…
What’s the command for full log? I typed “journalctl -b -0”, sorry I’m not a expert 
If you have eos-log-tool installed, it is easiest with that. It saves the log into a file in your home folder. It also can remove some “personal” information. Then you can copy that file here.
Or something like this:
sudo journalctl -b -0 | curl -F 'f:1=<-' ix.io
but that does not remove “personal” information.
You can look here for more log related commands: