No settings have changed, it just quit working 2 days ago. When I try to access it. The 2.4GHz is still working. Mercury retrograde?

Please read this, then provide some more information.

How do you know it stopped working?

Did anything in your configuration change before this happened?

Was there an update involved?

And so on.

New kernel update maybe?

Do other devices connect to 5GHz?
Is it a separate ssid from the 2.4GHz? If so can the PC see the ssid?

Could be be bad hardware.

Thank you michaelk. What is the syntax for using ssid? I have installed it.

This desktop machine runs oddly far too often, whereas my two laptops are skookum.

System:
Kernel: 5.15.0-82-generic x86_64 bits: 64 compiler: gcc v: 11.4.0 Desktop: Cinnamon 5.8.4
tk: GTK 3.24.33 wm: muffin dm: LightDM Distro: Linux Mint 21.2 Victoria base: Ubuntu 22.04 jammy
Machine:
Type: Desktop System: LENOVO product: 10MLS0SE00 v: ThinkCentre M910s
serial: <superuser required> Chassis: type: 3 serial: <superuser required>
Mobo: LENOVO model: 3106 v: SDK0J40697 WIN 3305065980651 serial: <superuser required>
UEFI-[Legacy]: LENOVO v: M1AKT24A date: 07/25/2017
CPU:
Info: quad core model: Intel Core i5-6500 bits: 64 type: MCP arch: Skylake-S rev: 3 cache:
L1: 256 KiB L2: 1024 KiB L3: 6 MiB
Speed (MHz): avg: 974 high: 1000 min/max: 800/3600 cores: 1: 1000 2: 930 3: 969 4: 1000
bogomips: 25599
Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3
Graphics:
Device-1: Intel HD Graphics 530 vendor: Lenovo driver: i915 v: kernel ports: active: DP-3
empty: DP-1, DP-2, HDMI-A-1, HDMI-A-2 bus-ID: 00:02.0 chip-ID: 8086:1912
Display: x11 server: X.Org v: 1.21.1.4 driver: X: loaded: modesetting unloaded: fbdev,vesa
gpu: i915 display-ID: :0 screens: 1
Screen-1: 0 s-res: 1920x1080 s-dpi: 96
Monitor-1: DP-3 model: AOC 24G2W1G5 res: 1920x1080 dpi: 93 diag: 604mm (23.8")
OpenGL: renderer: Mesa Intel HD Graphics 530 (SKL GT2) v: 4.6 Mesa 23.0.4-0ubuntu1~22.04.1
direct render: Yes
Audio:
Device-1: Intel 200 Series PCH HD Audio vendor: Lenovo driver: snd_hda_intel v: kernel
bus-ID: 00:1f.3 chip-ID: 8086:a2f0
Sound Server-1: ALSA v: k5.15.0-82-generic running: yes
Sound Server-2: JACK v: 1.9.20 running: no
Sound Server-3: PulseAudio v: 15.99.1 running: yes
Sound Server-4: PipeWire v: 0.3.48 running: yes
Network:
Device-1: Intel Ethernet I219-LM vendor: Lenovo driver: e1000e v: kernel port: N/A
bus-ID: 00:1f.6 chip-ID: 8086:15b7
IF: enp0s31f6 state: down mac: <filter>
Device-2: Realtek RTL88x2bu [AC1200 Techkey] type: USB driver: rtl88x2bu bus-ID: 1-7:4
chip-ID: 0bda:b812
IF: wlx347de44088ef state: up mac: <filter>
Drives:
Local Storage: total: 721.94 GiB used: 111.83 GiB (15.5%)
ID-1: /dev/sda vendor: Crucial model: CT275MX300SSD1 size: 256.17 GiB speed: 6.0 Gb/s
serial: <filter>
ID-2: /dev/sdb type: USB vendor: Western Digital model: WD5000AADS-00S9B0 size: 465.76 GiB
serial: <filter>
Partition:
ID-1: / size: 250.11 GiB used: 72.63 GiB (29.0%) fs: ext4 dev: /dev/sda5
ID-2: /boot/efi size: 512 MiB used: 6.1 MiB (1.2%) fs: vfat dev: /dev/sda2
Swap:
ID-1: swap-1 type: file size: 2 GiB used: 0 KiB (0.0%) priority: -2 file: /swapfilemichaelk
Sensors:
System Temperatures: cpu: 32.0 C mobo: N/A
Fan Speeds (RPM): N/A
Repos:
Packages: 2327 apt: 2319 flatpak: 8
No active apt repos in: /etc/apt/sources.list
Active apt repos in: /etc/apt/sources.list.d/brostrend.list
1: deb https: //linux.brostrend.com stable main previous
Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list
1: deb https: //mirror.csclub.uwaterloo.ca/linuxmint-packages victoria main upstream import backport
2: deb https: //mirror.csclub.uwaterloo.ca/ubuntu jammy main restricted universe multiverse
3: deb https: //mirror.csclub.uwaterloo.ca/ubuntu jammy-updates main restricted universe multiverse
4: deb https: //mirror.csclub.uwaterloo.ca/ubuntu jammy-backports main restricted universe multiversemichaelk
5: deb http: //security.ubuntu.com/ubuntu/ jammy-security main restricted universe multiversemichaelk
Active apt repos in: /etc/apt/sources.list.d/spotify.list
1: deb http: //repository.spotify.com stable non-free
Info:
Processes: 231 Uptime: 8h 55m Memory: 7.62 GiB used: 2.62 GiB (34.4%) Init: systemd v: 249
runlevel: 5 Compilers: gcc: 11.4.0 alt: 11/12 Client: Cinnamon v: 5.8.4 inxi: 3.3.13

SSID is the name the router or access point transmits as an identifier. You should be able to see it when you try to connect from network manager.

hapibeli,

I suggest that you first install the Wifi Analyzer (open-source) app on an Android phone. Other apps are available.

https://play.google.com/store/apps/d...m.wifianalyzer

This will tell you whether there is any output from your 5GHz network.

In my case there was a particular bug with the Broadcom BCM4360 802.11ac Wireless Network Adapter [14e4:43a0] (rev 03) so that it does not see 5GHz networks with a high channel number.

See confirmed bug #1574196 at Launchpad:
https://bugs.launchpad.net/ubuntu/+s...l/+bug/1574196

To rectify this, it is necessary to login to the router and change the channel for the 5GHz to a lower one.

In my ASUS router I went to Advanced Settings > Wireless > Wireless General > select 5GHz band.

Then clicked on Control Channel and reduced the figure from 140 maximum to 36.

Clicked on Apply and logged out.

The Wifi Analyzer immediately picked up a very strong signal from the 5GHz.

Your problem may well be totally unrelated to mine, but at least the Wifi Analyzer will tell you if you have any output from the 5GHz network.

Thank you beachboy2. I did so, and it shows up in my android as -58dBm CH 36 (38) 5180MHz ~3.7m
5170 - 5210 (40MHz)

It is a D-Link router. I should change the Channel to something closer to the 2.4 which is -41dBm CH 11 2462MHz ~1.1m
2452 - 2472 (20MHz) ?

WTH? All of a sudden it is working just fine! Hasn't for 3 days! I did call my service provider this morning early. Maybe they tweaked it without telling me...

I detest these combined units with modem, router, switch and AP all built in and possibly under control of ISP?
I have modem > router (with webserver, local ftp server and mail server) > switch > two AP-s (to cover most of my property). All separate and under my full control, except the modem which ISP can access. I have had modem/routers in past, but I always put them into bridge mode.

If it's a USB dongle, then maybe it overheated.