System unusable 1 out of 3 boots: Fence fallback timer expired on ring sdma0 or gfx

Brief summary of the problem

• During login screen (sddm) and after login the graphics are very very (unusable) slow.
• This happens about 1 out of 3 times when booting. Power off and power on often fixes the issue.

Hardware description:

• CPU: AMD Ryzen 7 4800H
• GPU: Integrated AMD Vega 7 & discrete AMD Navi 14 Radeon RX 5500M
• System Memory: 2x 8GB DDR4-3200
• Display(s): 1920x1080 @ 144Hz
• Type of Display Connection: eDP
• Laptop model: MSI Bravo 17 - A4DDR-035NL

System information:

• Distro name and Version: Arch Linux
• Kernel version: 5.9.9
• Using plymouth & sddm & lxqt

How to reproduce the issue:

• Boot system
• Login

Attached files:

dmesg-timer-expired.txt

Snippet of unusual messages in dmesg

Nov 23 19:37:03 pb450 kernel: [drm] Fence fallback timer expired on ring sdma0
Nov 23 19:37:03 pb450 kernel: [drm] Fence fallback timer expired on ring gfx
Nov 23 19:37:04 pb450 kernel: [drm] Fence fallback timer expired on ring sdma0
Nov 23 19:37:04 pb450 kernel: [drm] Fence fallback timer expired on ring gfx
Nov 23 19:37:04 pb450 kernel: [drm] Fence fallback timer expired on ring sdma0
Nov 23 19:37:05 pb450 kernel: [drm] Fence fallback timer expired on ring gfx
Nov 23 19:37:05 pb450 kernel: [drm] Fence fallback timer expired on ring sdma0
Nov 23 19:37:05 pb450 kernel: [drm] Fence fallback timer expired on ring sdma0
Nov 23 19:37:06 pb450 kernel: [drm] Fence fallback timer expired on ring sdma0
Nov 23 19:37:06 pb450 kernel: [drm] Fence fallback timer expired on ring sdma0
Nov 23 19:37:07 pb450 kernel: [drm] Fence fallback timer expired on ring gfx
Nov 23 19:37:07 pb450 kernel: [drm] Fence fallback timer expired on ring sdma0
Nov 23 19:37:07 pb450 kernel: [drm] Fence fallback timer expired on ring gfx
Nov 23 19:37:07 pb450 kernel: [drm] Fence fallback timer expired on ring sdma0
Nov 23 19:37:08 pb450 kernel: [drm] Fence fallback timer expired on ring sdma0
Nov 23 19:37:08 pb450 kernel: [drm] Fence fallback timer expired on ring gfx
Nov 23 19:37:09 pb450 kernel: [drm] Fence fallback timer expired on ring gfx
Nov 23 19:37:09 pb450 kernel: [drm] Fence fallback timer expired on ring sdma0
Nov 23 19:37:09 pb450 kernel: [drm] Fence fallback timer expired on ring sdma0
Nov 23 19:37:09 pb450 kernel: [drm] Fence fallback timer expired on ring gfx
Nov 23 19:37:10 pb450 kernel: [drm] Fence fallback timer expired on ring sdma0
Nov 23 19:37:10 pb450 kernel: [drm] Fence fallback timer expired on ring gfx