New Mint Cinnamon install, flickering mouse choppy screen

[erik530195]

To make a long story short, I've been led to this forum because everyone on other sites has run out of ideas. Up to this point I've completely reinstalled a verified ISO, updated everything, and tried a bunch of different desktop environments.

It took me hours to get a 4k primary 55" monitor working with two other smaller ones, to get the scaling and everything right. The only remaining issue with that is that the mouse starts flickering in and out after 5 mins or so, at which point I do the following:

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xrandr --output DP-1 --scale 0.9999x0.9999

The main issue at hand currently, regardless of whether I fix the mouse or not, is that the entire system is laggy and slow. It freezes up even while trying to type this post. Video playback whether it be youtube or an application is abysmal, regardless of resolution. I really like Cinnamon as I just switched from windows, and since the issues are present on other desktop environments I have to assume it's a hardware or driver issue. I have another Nuc with a celeron chip that has been beautiful with Mint, and plays youtube all day long. (This makes me hesitate to believe it's an intel issue)

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System:
  Kernel: 5.4.0-80-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 
  Desktop: Cinnamon 5.0.5 wm: muffin 5.0.1 dm: SDDM 
  Distro: Linux Mint 20.2 Uma base: Ubuntu 20.04 focal 
Machine:
  Type: Desktop System: Intel Client Systems product: NUC8i7BEH 
  v: J72992-304 serial: <filter> Chassis: Intel Corporation type: 3 v: 2.0 
  serial: <filter> 
  Mobo: Intel model: NUC8BEB v: J72688-304 serial: <filter> UEFI: Intel 
  v: BECFL357.86A.0085.2020.1007.1917 date: 10/07/2020 
CPU:
  Topology: Quad Core model: Intel Core i7-8559U bits: 64 type: MT MCP 
  arch: Kaby Lake rev: A L2 cache: 8192 KiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
  bogomips: 43198 
  Speed: 540 MHz min/max: 400/4500 MHz Core speeds (MHz): 1: 640 2: 611 
  3: 609 4: 633 5: 680 6: 628 7: 601 8: 631 
Graphics:
  Device-1: Intel Iris Plus Graphics 655 driver: i915 v: kernel 
  bus ID: 00:02.0 chip ID: 8086:3ea5 
  Display: x11 server: X.Org 1.20.9 driver: modesetting unloaded: fbdev,vesa 
  resolution: 3840x2160~30Hz, 1360x768~60Hz, 1920x1080~60Hz 
  OpenGL: renderer: Mesa Intel Iris Plus Graphics 655 (CFL GT3) 
  v: 4.6 Mesa 20.2.6 direct render: Yes 
Audio:
  Device-1: Intel Cannon Point-LP High Definition Audio 
  driver: snd_hda_intel v: kernel bus ID: 00:1f.3 chip ID: 8086:9dc8 
  Sound Server: ALSA v: k5.4.0-80-generic 
Network:
  Device-1: Intel Cannon Point-LP CNVi [Wireless-AC] driver: iwlwifi 
  v: kernel port: 4000 bus ID: 00:14.3 chip ID: 8086:9df0 
  IF: wlp0s20f3 state: down mac: <filter> 
  Device-2: Intel Ethernet I219-V driver: e1000e v: 3.2.6-k port: efa0 
  bus ID: 00:1f.6 chip ID: 8086:15be 
  IF: eno1 state: up speed: 1000 Mbps duplex: full mac: <filter> 
  Device-3: Realtek RTL8153 Gigabit Ethernet Adapter type: USB driver: r8152 
  bus ID: 4-1.1:3 chip ID: 0bda:8153 serial: <filter> 
  IF: enx34298f7708ea state: down mac: <filter> 
Drives:
  Local Storage: total: 596.15 GiB used: 32.47 GiB (5.4%) 
  ID-1: /dev/sda vendor: Team model: TM8PS7512G size: 476.94 GiB 
  speed: 6.0 Gb/s serial: <filter> rev: .0 scheme: GPT 
  ID-2: /dev/sdb type: USB vendor: SanDisk model: Cruzer size: 119.21 GiB 
  serial: <filter> rev: 1.00 scheme: MBR 
Partition:
  ID-1: / size: 467.96 GiB used: 15.15 GiB (3.2%) fs: ext4 dev: /dev/sda2 
Sensors:
  System Temperatures: cpu: 83.0 C mobo: 27.8 C 
  Fan Speeds (RPM): N/A 
Repos:
  No active apt repos in: /etc/apt/sources.list 
  Active apt repos in: /etc/apt/sources.list.d/linrunner-tlp-focal.list 
  1: deb http://ppa.launchpad.net/linrunner/tlp/ubuntu focal main
  Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list 
  1: deb http://packages.linuxmint.com uma main upstream import backport #id:linuxmint_main
  2: deb http://archive.ubuntu.com/ubuntu focal main restricted universe multiverse
  3: deb http://archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse
  4: deb http://archive.ubuntu.com/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/vivaldi.list 
  1: deb http://repo.vivaldi.com/stable/deb/ stable main
Info:
  Processes: 288 Uptime: 7m Memory: 15.51 GiB used: 1.49 GiB (9.6%) 
  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 

[SMG]

To make a long story short, I've been led to this forum because everyone on other sites has run out of ideas. Up to this point I've completely reinstalled a verified ISO, updated everything, and tried a bunch of different desktop environments.

Welcome to the forum, erik530195.

Have you tried a newer kernel? The 5.11 is available in Update Manager and I expect it will be a better match for your 8th-gen Intel especially given the multiple larger monitors.

Open Update Manager. Select View > Linux Kernels and click Continue. Make sure 5.11 is selected on the left panel and then click the top-most option on the right panel. An "Install" button will appear. Install the kernel and then reboot for it to become active.