External monitor flickering/white

System information

inxi -GSC -xx

12System:    12Kernel 5.9.8-100.fc32.x86_64 x86_64 12bits 64 12compiler gcc 12v 2.34-6.fc32) 
           12Desktop GNOME 3.36.7 12tk GTK 3.24.23 12wm gnome-shell 12dm GDM 
           12Distro Fedora release 32 (Thirty Two) 
12CPU:       12Info 6-Core 12model AMD Ryzen 5 4600H with Radeon Graphics 12bits 64 12type MT MCP 12arch Zen 
           12rev 1 12L2 cache 3072 KiB 
           12flags avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm 12bogomips 71864 
           12Speed 1397 MHz 12min/max 1400/3000 MHz 12boost enabled 12Core speeds (MHz) 121 1397 122 1397 
           123 1632 124 1396 125 1398 126 1397 127 1397 128 1397 129 1471 1210 1742 1211 1397 1212 1397 
12Graphics:  12Device-1 NVIDIA TU117M 12vendor Lenovo 12driver nouveau 12v kernel 12bus ID 01:00.0 
           12chip ID 10de:1f99 
           12Device-2 AMD Renoir 12vendor Lenovo 12driver amdgpu 12v kernel 12bus ID 05:00.0 
           12chip ID 1002:1636 
           12Device-3 Syntek Integrated Camera 12type USB 12driver uvcvideo 12bus ID 1-3:3 
           12chip ID 174f:244c 
           12Display wayland 12server Fedora Project X.org 1.20.9 12compositor gnome-shell 
           12driver ati,modesetting 12unloaded fbdev,vesa 12alternate amdgpu 12resolution 
           121 1920x1080~120Hz 122 1920x1080~120Hz 12s-dpi 96 
           12OpenGL 12renderer AMD RENOIR (DRM 3.39.0 5.9.8-100.fc32.x86_64 LLVM 10.0.0) 
           12v 4.6 Mesa 20.0.4 12direct render Yes

Describe the issue

After updating from mesa-20.1.10 to 20.2.2, my external monitor connected via HDMI doesn't seem to draw on most of the screen. Moving windows around seems to cause the affected area to flicker.

Regression

Yes, the update from mesa-20.1.10 to 20.2.2 broke external monitors for me. Downgrading back to 20.1.10 fixed the problem immediately.

Screenshots/video files (if applicable)