Graphical glitches with Vega 8 on Manjaro KDE

Folks, I am new to manjaro, this is my first installation. I'm having problems similar to this report in this topic that was closed, but I couldn't understand how I could solve this problem with what was posted there.

This is exactly what is happening as reported by @hamstersztyk below.

I started seeing weird graphical glitches, occasionally in 2d/3d graphics programs, sometimes in the UI, and very frequently in Firefox. The glitches are random lines on the screen, sometime with some content from another place on the screen. In attached screenshots you can see that textures in graphical applications are sometimes corrupted as well. I don't think it's a corrupted GPU because I don't have any problems with it on Windows 10

Can someone explain to me?

  Host: MANJARO Kernel: 5.6.16-1-MANJARO x86_64 bits: 64 compiler: gcc 
  v: 10.1.0 Desktop: KDE Plasma 5.18.5 tk: Qt 5.15.0 wm: kwin_x11 
  dm: SDDM Distro: Manjaro Linux 
  Type: Desktop Mobo: Gigabyte model: B450 AORUS M v: x.x 
  serial: <filter> UEFI: American Megatrends v: F50 date: 11/27/2019 
  Topology: Quad Core model: AMD Ryzen 3 3200G with Radeon Vega Graphics 
  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: 28759 
  Speed: 1258 MHz min/max: 1400/3600 MHz boost: enabled 
  Core speeds (MHz): 1: 1259 2: 1296 3: 1259 4: 1264 
  Device-1: AMD Picasso driver: amdgpu v: kernel bus ID: 06:00.0 
  chip ID: 1002:15d8 
  Display: x11 server: X.Org 1.20.8 driver: amdgpu FAILED: ati 
  unloaded: modesetting alternate: fbdev,vesa compositor: kwin_x11 
  resolution: 1920x1080~60Hz 
  OpenGL: renderer: AMD RAVEN (DRM 3.36.0 5.6.16-1-MANJARO LLVM 10.0.0) 
  v: 4.6 Mesa 20.0.7 direct render: Yes 
  Device-1: AMD Raven/Raven2/Fenghuang HDMI/DP Audio 
  driver: snd_hda_intel v: kernel bus ID: 06:00.1 chip ID: 1002:15de 
  Device-2: AMD Family 17h HD Audio vendor: Gigabyte 
  driver: snd_hda_intel v: kernel bus ID: 06:00.6 chip ID: 1022:15e3 
  Device-3: Corsair Corsair VOID RGB USB Gaming Headset type: USB 
  driver: hid-generic,snd-usb-audio,usbhid bus ID: 1-3:2 
  chip ID: 1b1c:1b2a serial: <filter> 
  Sound Server: ALSA v: k5.6.16-1-MANJARO 
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: Gigabyte driver: r8169 v: kernel port: f000 bus ID: 03:00.0 
  chip ID: 10ec:8168 
  IF: eno1 state: up speed: 100 Mbps duplex: full mac: <filter> 
  Local Storage: total: 1.59 TiB used: 8.52 GiB (0.5%) 
  ID-1: /dev/sda vendor: Seagate model: ST3250318AS size: 232.89 GiB 
  speed: 3.0 Gb/s rotation: 7200 rpm serial: <filter> rev: CC37 
  scheme: MBR 
  ID-2: /dev/sdb vendor: Western Digital model: WD5000AAKX-003CA0 
  size: 465.76 GiB speed: 6.0 Gb/s serial: <filter> rev: 1H15 scheme: GPT 
  ID-3: /dev/sdc vendor: Seagate model: ST1000LM024 HN-M101MBB 
  size: 931.51 GiB speed: 3.0 Gb/s rotation: 5400 rpm serial: <filter> 
  rev: 0002 scheme: MBR 
  ID-1: / size: 227.73 GiB used: 8.52 GiB (3.7%) fs: ext4 dev: /dev/sda1 
  System Temperatures: cpu: 33.2 C mobo: N/A gpu: amdgpu temp: 33 C 
  Fan Speeds (RPM): N/A 
  Processes: 201 Uptime: 33m Memory: 13.68 GiB used: 1.76 GiB (12.9%) 
  Init: systemd v: 245 Compilers: gcc: 10.1.0 Shell: bash v: 5.0.17 
  running in: konsole inxi: 3.0.37

Hi, have you updated your mobo to the latest bios/UEFI?
I'm having issues with B450 mobo and 2400g. Some things I've tried that may help you are:
try other kernels like 5.4 LTS, even older ones like 4.19 or 4.14;
turn off compositor as described in the wiki:
"To disable the XFCE window manager's compositor
Following are two ways to turn off compositing in Xfce.
Using the Xfce GUI:
Settings -> Window Manager Tweaks -> Compositor tab ->
uncheck 'Enable display compositing' checkbox"
try video-modesetting driver
None of the above is dangerous and can be easily undone. I've done all as part of troubleshooting my own problems.

hth & gl

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