I'm suspecting it's some weird driver issue. I also tried rebooting. It went away then slowly started to come back.
Added video to show what I mean:
https://www.youtube.com/watch?v=---dY0usoe4
When it goes black it's because I'm switching to the other machine just to show that it does not happen to that one. Both are on same site.
Here's some info that might help:
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Screen 0: minimum 320 x 200, current 3840 x 4320, maximum 16384 x 16384
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 connected primary 3840x2160+0+2160 (normal left inverted right x axis y axis) 621mm x 341mm
3840x2160 60.00 + 60.00 50.00* 59.94 30.00 25.00 24.00 29.97 23.98
2560x1440 59.95
1920x1200 60.00
1920x1080 60.00 50.00 59.94 24.00 23.98
1600x1200 60.00
1680x1050 59.88
1280x1024 60.02
1440x900 59.90
1280x960 60.00
1280x800 59.91
1280x720 60.00 50.00 59.94
1440x576 50.00
1024x768 60.00
1440x480 60.00 59.94
800x600 60.32 56.25
720x576 50.00
720x480 60.00 59.94
640x480 60.00 59.94
HDMI-A-1 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 621mm x 341mm
3840x2160 60.00 + 60.00 50.00* 59.94 30.00 25.00 24.00 29.97 23.98
2560x1440 59.95
1920x1200 60.00
1920x1080 60.00 50.00 59.94 24.00 23.98
1600x1200 60.00
1680x1050 59.88
1280x1024 60.02
1440x900 59.90
1280x960 60.00
1280x800 59.91
1280x720 60.00 50.00 59.94
1440x576 50.00
1024x768 60.00
1440x480 60.00 59.94
800x600 60.32 56.25
720x576 50.00
720x480 60.00 59.94
640x480 60.00 59.94
DVI-D-0 disconnected (normal left inverted right x axis y axis)
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System:
Kernel: 5.11.0-37-generic x86_64 bits: 64 compiler: N/A
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: Desktop Mobo: ASUSTeK model: PRIME B350-PLUS v: Rev X.0x
serial: <filter> UEFI: American Megatrends v: 5407 date: 12/31/2019
CPU:
Topology: Quad Core model: AMD Ryzen 3 1300X bits: 64 type: MCP arch: Zen
rev: 1 L2 cache: 2048 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
bogomips: 27946
Speed: 1546 MHz min/max: 1550/3500 MHz boost: enabled Core speeds (MHz):
1: 1547 2: 1547 3: 1551 4: 1551
Graphics:
Device-1: AMD Ellesmere [Radeon RX 470/480/570/570X/580/580X/590]
vendor: Micro-Star MSI driver: amdgpu v: kernel bus ID: 07:00.0
chip ID: 1002:67df
Display: x11 server: X.Org 1.20.11 driver: amdgpu,ati
unloaded: fbdev,modesetting,vesa tty: N/A
OpenGL: renderer: Radeon RX 580 Series (POLARIS10 DRM 3.40.0
5.11.0-37-generic LLVM 12.0.0)
v: 4.6 Mesa 21.0.3 direct render: Yes
Audio:
Device-1: AMD Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590]
vendor: Micro-Star MSI driver: snd_hda_intel v: kernel bus ID: 07:00.1
chip ID: 1002:aaf0
Device-2: AMD Family 17h HD Audio vendor: ASUSTeK driver: snd_hda_intel
v: kernel bus ID: 09:00.3 chip ID: 1022:1457
Sound Server: ALSA v: k5.11.0-37-generic
Network:
Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
vendor: ASUSTeK driver: r8169 v: kernel port: f000 bus ID: 03:00.0
chip ID: 10ec:8168
IF: enp3s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
Drives:
Local Storage: total: 342.81 GiB used: 214.73 GiB (62.6%)
ID-1: /dev/sda vendor: Crucial model: M4-CT128M4SSD2 size: 119.24 GiB
speed: 6.0 Gb/s serial: <filter> rev: 0309 scheme: GPT
ID-2: /dev/sdb vendor: Kingston model: SA400S37240G size: 223.57 GiB
speed: 6.0 Gb/s serial: <filter> rev: 71E0 scheme: GPT
Partition:
ID-1: / size: 116.38 GiB used: 19.92 GiB (17.1%) fs: ext4 dev: /dev/sda2
Sensors:
System Temperatures: cpu: 30.6 C mobo: N/A gpu: amdgpu temp: 55 C
Fan Speeds (RPM): N/A gpu: amdgpu fan: 1103
Repos:
No active apt repos in: /etc/apt/sources.list
Active apt repos in: /etc/apt/sources.list.d/audio-recorder-ppa-focal.list
1: deb http://ppa.launchpad.net/audio-recorder/ppa/ubuntu focal main
Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list
1: deb http://packages.linuxmint.com ulyssa 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
Info:
Processes: 254 Uptime: 1h 42m Memory: 15.57 GiB used: 4.00 GiB (25.7%)
Init: systemd v: 245 runlevel: 5 Compilers: gcc: 9.3.0 alt: 8/9
Shell: bash v: 5.0.17 running in: gnome-terminal inxi: 3.0.38