WiFi disconnecting every few minutes on Linux Mint 20.1

[moonless]

I have had Mint for about a month now, and since installation I've been having this problem where the WiFi randomly disconnects every once and a while. I use windows on this same PC, and have 0 problems with WiFI. I would really apreciate it if anyone could give some guidance. I already disabled IPv6 and power save, but nothing changed unfortunately.

[Larry78723]

Without some technical information, we can’t help you. Please post an inxi -Fxxxzr report. This will give us a concise overview of your hardware and on how Mint sees it.

Here is how to generate the report and post it:

Open a terminal window (Ctrl-Alt-t). Make it fullscreen to avoid unneeded linebreaks or chopped lines. Execute the command

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 inxi -Fxxxzr 

exactly as it has been typed here.

Mark the complete text output which the command will display with your mouse.
Press the keyboard shortcut <Shift><Ctrl>C to copy the marked text into the clipboard.
Enclose the results between the code markers by selecting </> from the mini toolbar above the textbox where you type your reply then paste <Ctrl>V them in your reply between the code markers [code]Results [/code].

The results will help us to help you.

[moonless]

Here's the result from executing inxi -Fxxxzr:

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System:
  Kernel: 5.4.0-74-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 
  Desktop: Cinnamon 4.8.6 wm: muffin 4.8.1 dm: LightDM 1.30.0 
  Distro: Linux Mint 20.1 Ulyssa base: Ubuntu 20.04 focal 
Machine:
  Type: Laptop System: LENOVO product: 20N9000GBR v: ThinkPad E490 
  serial: <filter> Chassis: type: 10 serial: <filter> 
  Mobo: LENOVO model: 20N9000GBR v: SDK0J40697 WIN serial: <filter> 
  UEFI: LENOVO v: R0YET42W (1.25 ) date: 01/13/2020 
Battery:
  ID-1: BAT0 charge: 40.9 Wh condition: 40.9/45.7 Wh (89%) volts: 12.3/11.1 
  model: SMP 01AV447 type: Li-poly serial: <filter> status: Full cycles: 168 
CPU:
  Topology: Quad Core model: Intel Core i5-8265U bits: 64 type: MT MCP 
  arch: Kaby Lake rev: C L2 cache: 6144 KiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
  bogomips: 28800 
  Speed: 837 MHz min/max: 400/3900 MHz Core speeds (MHz): 1: 804 2: 866 
  3: 801 4: 845 5: 905 6: 875 7: 854 8: 874 
Graphics:
  Device-1: Intel UHD Graphics 620 vendor: Lenovo driver: i915 v: kernel 
  bus ID: 00:02.0 chip ID: 8086:3ea0 
  Display: x11 server: X.Org 1.20.9 driver: modesetting unloaded: fbdev,vesa 
  resolution: 1366x768~60Hz 
  OpenGL: renderer: Mesa Intel UHD Graphics 620 (WHL GT2) v: 4.6 Mesa 20.2.6 
  direct render: Yes 
Audio:
  Device-1: Intel Cannon Point-LP High Definition Audio vendor: Lenovo 
  driver: snd_hda_intel v: kernel bus ID: 00:1f.3 chip ID: 8086:9dc8 
  Sound Server: ALSA v: k5.4.0-74-generic 
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: Lenovo driver: r8169 v: kernel port: 3000 bus ID: 04:00.0 
  chip ID: 10ec:8168 
  IF: enp4s0 state: down mac: <filter> 
  Device-2: Realtek RTL8822BE 802.11a/b/g/n/ac WiFi adapter 
  vendor: Lenovo ThinkPad E595 driver: rtw_pci v: N/A port: 2000 
  bus ID: 05:00.0 chip ID: 10ec:b822 
  IF: wlp5s0 state: up mac: <filter> 
Drives:
  Local Storage: total: 465.76 GiB used: 60.74 GiB (13.0%) 
  ID-1: /dev/sda vendor: Western Digital model: WD5000LPLX-08ZNTT0 
  size: 465.76 GiB speed: 6.0 Gb/s rotation: 7200 rpm serial: <filter> 
  rev: 1A05 scheme: GPT 
Partition:
  ID-1: / size: 95.62 GiB used: 60.71 GiB (63.5%) fs: ext4 dev: /dev/sda5 
Sensors:
  System Temperatures: cpu: 46.0 C mobo: 0.0 C 
  Fan Speeds (RPM): cpu: 0 
Repos:
  No active apt repos in: /etc/apt/sources.list 
  Active apt repos in: /etc/apt/sources.list.d/google-chrome.list 
  1: deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main
  Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list 
  1: deb http://mirrors.evowise.com/linuxmint/packages ulyssa main upstream import backport
  2: deb http://ubuntu-archive.locaweb.com.br/ubuntu focal main restricted universe multiverse
  3: deb http://ubuntu-archive.locaweb.com.br/ubuntu focal-updates main restricted universe multiverse
  4: deb http://ubuntu-archive.locaweb.com.br/ubuntu focal-backports main restricted universe multiverse
  5: deb http://security.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
  6: deb http://archive.canonical.com/ubuntu/ focal partner
  Active apt repos in: /etc/apt/sources.list.d/spotify.list 
  1: deb http://repository.spotify.com stable non-free
Info:
  Processes: 287 Uptime: 5h 45m Memory: 7.50 GiB used: 3.63 GiB (48.4%) 
  Init: systemd v: 245 runlevel: 5 Compilers: gcc: 9.3.0 alt: 9 Shell: bash 
  v: 5.0.17 running in: gnome-terminal inxi: 3.0.38 

[Larry78723]

Open a terminal and run the following command:

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sudo sed -i 's/3/2/' /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf 

Reboot and test.