Wifi at 2.4 GHz doesn't work but at 5 GHz it does

[timidos]

Hi.
Linux Mint updated to 19.2 with no internet via wi-fi.
I have router with 2.4GHz and 5GHz frequencies. At Linux Mint 2.4GHz - connected, but not working; 5GHz - connected and working. On Windows at same machine - both works fine.
2.4GHz stoped working just few days ago, for no reason.

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oleg@oleg-GL703VM:~$ ping google.com
connect: Network is unreachable

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oleg@oleg-GL703VM:~$  inxi -Fxz 
System:    Host: oleg-GL703VM Kernel: 5.0.0-25-generic x86_64 bits: 64 compiler: gcc v: 7.4.0 Desktop: Cinnamon 4.2.4 
           Distro: Linux Mint 19.2 Tina base: Ubuntu 18.04 bionic 
Machine:   Type: Laptop System: ASUSTeK product: GL703VM v: 1.0 serial: <filter> 
           Mobo: ASUSTeK model: GL703VM v: 1.0 serial: <filter> UEFI: American Megatrends v: GL703VM.314 date: 04/29/2019 
Battery:   ID-1: BAT1 charge: 51.8 Wh condition: 51.8/64.4 Wh (80%) model: ASUS A32-K55 status: Full 
CPU:       Topology: Quad Core model: Intel Core i7-7700HQ bits: 64 type: MT MCP arch: Kaby Lake rev: 9 L2 cache: 6144 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 44928 
           Speed: 800 MHz min/max: 800/3800 MHz Core speeds (MHz): 1: 800 2: 800 3: 800 4: 800 5: 800 6: 800 7: 800 8: 800 
Graphics:  Device-1: NVIDIA GP106M [GeForce GTX 1060 Mobile] vendor: ASUSTeK driver: nvidia v: 430.40 bus ID: 01:00.0 
           Display: x11 server: X.Org 1.19.6 driver: nvidia unloaded: fbdev,modesetting,nouveau,vesa 
           resolution: 1920x1080~60Hz 
           OpenGL: renderer: GeForce GTX 1060/PCIe/SSE2 v: 4.6.0 NVIDIA 430.40 direct render: Yes 
Audio:     Device-1: Intel CM238 HD Audio vendor: ASUSTeK driver: snd_hda_intel v: kernel bus ID: 00:1f.3 
           Device-2: NVIDIA GP106 High Definition Audio driver: snd_hda_intel v: kernel bus ID: 01:00.1 
           Device-3: JMTek LLC. type: USB driver: hid-generic,snd-usb-audio,usbhid bus ID: 1-1:2 
           Sound Server: ALSA v: k5.0.0-25-generic 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: ASUSTeK driver: r8169 v: kernel port: d000 
           bus ID: 02:00.0 
           IF: enp2s0 state: down mac: <filter> 
           Device-2: Intel Wireless 8265 / 8275 driver: iwlwifi v: kernel port: d000 bus ID: 04:00.0 
           IF: wlp4s0 state: up mac: <filter> 
           IF-ID-1: tun0 state: down mac: N/A 
           IF-ID-2: tun1 state: unknown speed: 10 Mbps duplex: full mac: N/A 
Drives:    Local Storage: total: 1.14 TiB used: 710.28 GiB (60.7%) 
           ID-1: /dev/sda vendor: SK Hynix model: HFS256G39TND-N210A size: 238.47 GiB temp: 45 C 
           ID-2: /dev/sdb vendor: HGST (Hitachi) model: HTS721010A9E630 size: 931.51 GiB temp: 39 C 
RAID:      Hardware-1: Intel 82801 Mobile SATA Controller [RAID mode] driver: ahci v: 3.0 bus ID: 00:17.0 
Partition: ID-1: / size: 33.22 GiB used: 24.20 GiB (72.8%) fs: ext4 dev: /dev/sda5 
           ID-2: /home size: 25.83 GiB used: 21.33 GiB (82.6%) fs: ext4 dev: /dev/sda6 
Sensors:   System Temperatures: cpu: 63.0 C mobo: N/A gpu: nvidia temp: 56 C 
           Fan Speeds (RPM): cpu: 0 
Info:      Processes: 330 Uptime: 1h 08m Memory: 31.37 GiB used: 5.49 GiB (17.5%) Init: systemd runlevel: 5 Compilers: 
           gcc: 7.4.0 Shell: bash v: 4.4.20 inxi: 3.0.32 

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oleg@oleg-GL703VM:~$  rfkill list all 
0: hci0: Bluetooth
	Soft blocked: no
	Hard blocked: no
1: phy0: Wireless LAN
	Soft blocked: no
	Hard blocked: no

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oleg@oleg-GL703VM:~$ iwconfig
enp2s0    no wireless extensions.

lo        no wireless extensions.

wlp4s0    IEEE 802.11  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=20 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          

[kelebek333]

Suggestion 1: You can try to manually select 2.4 Ghz band for your connection with nm-connection-editor.

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nm-connection-editor

Suggestion 2: You can try to disable power management of network manager with following commands.

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echo -e '[connection]\nwifi.powersave = 2' | sudo tee /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf

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sudo service network-manager restart

Suggestion 3: You can try to create a configuration file for iwlwifi driver with following command. Then, you must restart your PC.

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echo "options iwlwifi 11n_disable=2 swcrypto=1" | sudo tee /etc/modprobe.d/iwlwifi.conf

[timidos]

kelebek333 , thank for your suggestions. But they didn't help me.

[phd21]

Hi timidos,

It could be that the Linux Kernel 5.0.0 has an issue with that particular WiFi adapter, and you can try Linux Kernel 4.15 (default), or 4.18.xx, or perhaps a newer Linux Kernel 5.0.xx (.xx above "0"), or 5.1.xx or 5.2.xx.

Side note: My Network Manager connections did not show options for choosing "Client" mode or the WiFi band using the default Infrastructure mode, but does in "ad-hoc" mode or "Access Point" mode?

[SOLVED] Intel® Dual Band Wireless-AC 8265 , no Wifi - Linux Mint Forums
viewtopic.php?t=243925

[SOLVED] Intel 8265 / 8275 - WiFi "Unavailable" - Linux Mint Forums
viewtopic.php?t=285630

wireless - Intel 8265/8275 wifi - Ask Ubuntu
https://askubuntu.com/questions/1149328 ... ect=1&lq=1

en:users:drivers:iwlwifi [Linux Wireless]
https://wireless.wiki.kernel.org/en/use ... rs/iwlwifi

Hope this helps ...

[timidos]

Hi phd21.
I checked internet connection using 2.4Ghz on several linux kernels and it doesn't work too. I tried kernel 4.18.0-25, 5.0.0-15, 5.0.0-20. However, internet works fine on older kernels earlier (when they were newest versions).

[Spearmint2]

maybe computer hardware problem. Disable the bluetooth first, then try again.

[timidos]

Hi Spearmint2. I think, it's not true because it works on Windows on same machine

[JeremyB]

do

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wget -N -t 5 -T 10 https://github.com/UbuntuForums/wireless-info/raw/master/wireless-info && chmod +x wireless-info

Then reboot and try to connect to 2.4GHz, then do

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./wireless-info

Connect to internet and do

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cat wireless-info.txt | nc termbin.com 9999

Post termbin URL

[timidos]

JeremyB, done. Link is https://termbin.com/voqp

[Spearmint2]

who controls the router you connect to? Have you checked settings in it on the 2.4 Ghz band? I'm just wondering if someone blocked you on the router from using that band. Looking over what you pasted, I don't see a problem with your wifi.

[Larry78723]

It appears that there is an update to the iwlwifi driver. See https://wireless.wiki.kernel.org/en/use ... rs/iwlwifi.

[Spearmint2]

It appears that there is an update to the iwlwifi driver. See https://wireless.wiki.kernel.org/en/use ... rs/iwlwifi.

I hope he notices this part, and compare to what I posted before.

About iwldvm support and known issues
Wi-Fi / Bluetooth coexistence

Having Wi-Fi and Bluetooth running at the same time is a challenge. These scenarios have been tested thoroughly on 7260 and up, less so on earlier devices. This is why some people may face issues with devices that are handled by iwldvm. For users of these devices who have problems when Wi-Fi and Bluetooth are running concurrently, we suggest to disable BT Coex by loading iwlwifi with bt_coex_active=0 as a module parameter.

[JeremyB]

Do

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sudo iwconfig wlp4s0 power off
echo "options iwlwifi 11n_disable=8" | sudo tee /etc/modprobe.d/iwlopts.conf

Reboot

[timidos]

JeremyB, your method didn't fix the problem. 2.4GHz still not work.

[cadu_sg]

I had the same problem, but in Ubuntu 20.04 LTS notebook with Intel Corporation Wireless 3160 wireless hardware.
The solution for me was to set NetworkManager to use iwd instead of wpa_supplicant as it's wireless daemon.

1. Install iwd

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sudo apt update && sudo apt install -y iwd

I don't know why, but iwd was not available for my repositories, if that is your case too, you can download the package with wget.

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wget -q http://archive.ubuntu.com/ubuntu/pool/universe/i/iwd/iwd_1.5-1_amd64.deb && sudo apt install -y ./iwd_1.5-1_amd64.deb

2. Create this file inside your NetworkManager configuration files directory

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sudo nano /etc/NetworkManager/conf.d/wifi_backend.conf

[device]
wifi.backend=iwd

3. Stop and disable wpa_supplicant service

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sudo systemctl stop wpa_supplicant.service
sudo systemctl disable wpa_supplicant.service

4. Enable and start iwd service

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sudo systemctl enable iwd.service
sudo systemctl start iwd.service

5. Restart NetworkManager service

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sudo systemctl restart network-manager.service

No need to reboot your system .

References:
https://wiki.archlinux.org/index.php/Ne ... n/Wireless
https://wiki.archlinux.org/index.php/Iwd
https://wiki.archlinux.org/index.php/Wpa_supplicant
https://blobfolio.com/2019/10/replacing ... untu-eoan/

[kawasakidin]

Thank you so much for telling about iwd. Now my pc can connect to 2ghz instead of poor 5ghz. i wish u best in life!