I've installed https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.8-rc3/ and the problem seems to have been solved. My laptop is a HP-Pavilion-Laptop-15-cw1xxx, CPU: AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx.
I've installed https:/ /kernel. ubuntu. com/~kernel- ppa/mainline/ v5.8-rc3/ and the problem seems to have been solved. My laptop is a HP-Pavilion- Laptop- 15-cw1xxx, CPU: AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx.