Created attachment 842864 [details]
screenshot of kernel panic upon booting kernel-default-5.8.14

Hi All,

I'm currently on kernel-default-5.8.14-1.2.x86_64 and
kernel-firmware...20201005

Upon boot, my system (AMD Ryzen 5 PRO 4650G with Radeon Graphics, Gigabyte
B550M AORUS PRO (rev. 1.0) - most recent bios F10,  Display DELL U4320Q,
3840x2160 via displayport) frequently hangs with kernel-panic.

Statistically, about one out of 5 boot-attempts are successful, sometimes it
works on first attempt, sometimes it takes significantly more than 5 attempts,
seems random.

However, once boot was successful, I can run the computer without any stability
issues the entire day.
As the machine works nice apart from booting (or with nomodeset to avoid
loading amdgpu), I think defective hardware can be ruled out.
The only thing that does not work reliably is booting.


Unfortunately I seem not to be able to get a direct log from the kernel-panic,
I only managed to take a photo of the screen (attached).

I also tried kernel:stable as of today:
kernel-default-5.9.1-1.1.g8abc535.x86_64 plus the corresponding firmware from
the same source - same result: most boot attempts lead to kernel panic.

This is NOT a new problem / regression with a specific kernel or tumbleweed
version, I'm experiencing these problems since I bought the Ryzen APU (plus
mainboard).
I did test various kernel versions starting from 5.8.x since about 2 months,
all more or less the same behavior.

As this is my first bug submission here, please be patient if any required
information is missing, I'll try my best to deliver them upon request.

Thanks!