[regression][bisected]Corrupted screen with kernel 5.11 or later

Brief summary of the problem:

Installed ubuntu mainline kernel 5.11.3 on Ubuntu 20.10. System boots up fine, but the screen is corrupted. See attached image.

Hardware description:

• CPU: AMD Ryzen 7 Pro 4750G Renoir APU
• GPU: Integrated Graphics
• System Memory: 64GB
• Display(s): Viewsonic VX3276
• Type of Display Connection: HDMI

System infomration:

• Distro name and Version: Ubuntu 20.10
• Kernel version: 5.11.3 (also 5.12-rc2)
• Custom kernel:
• AMD package version: "No package"

How to reproduce the issue:

1. Install ubuntu mainline kernel 5.11.3 on Ubuntu 20.10 using ubuntu-mainline-kernel.sh tool.
2. Reboot the system with the new kernel.

System boots up fine, but the screen is corrupted. See attached image.

Also occurs with kernels 5.11, 5.12-rc2. Does not occur with kernel 5.10.20.

Attached files:

corruptedscreen normalscreen dmesg.log