Comment 73 for bug 1873895

Same issue with Ubuntu Mate HWE 20.04 with kernel 5.8 and latest AMD driver from oibaf PPA.

$ inxi -SMG
System: Host: ACER-xk2308 Kernel: 5.8.0-38-generic x86_64 bits: 64 Desktop: MATE 1.24.0
           Distro: Ubuntu 20.04.1 LTS (Focal Fossa)
Machine: Type: Desktop System: MSI product: MS-7798 v: 1.0 serial: <superuser/root required>
           Mobo: MSI model: B75MA-P45 (MS-7798) v: 1.0 serial: <superuser/root required> BIOS: American Megatrends v: 1.9
           date: 09/30/2013
Graphics: Device-1: Advanced Micro Devices [AMD/ATI] Navi 10 [Radeon RX 5600 OEM/5600 XT / 5700/5700 XT] driver: amdgpu
           v: kernel
           Display: x11 server: X.Org 1.20.9 driver: amdgpu,ati unloaded: fbdev,modesetting,radeon,vesa
           resolution: 1366x768~60Hz
           OpenGL: renderer: AMD Radeon RX 5600 XT (NAVI10 DRM 3.38.0 5.8.0-38-generic LLVM 11.0.1)
           v: 4.6 Mesa 21.1.0-devel (git-7b48d5d 2021-01-16 focal-oibaf-ppa)
$ hwe-support-status --verbose
Your Hardware Enablement Stack (HWE) is supported until avril 2025

Please, let me know what to do, for testing what you want.