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Few days ago my Radeon RX 5700 after 3 years of working absolutely fine, kind
of stopped working.

The symptoms are:
- At BIOS and GRUB there is video output.
- If I run the system with "nomodeset" kernel option, then there is video
output (obviously without acceleration and limited to low resolution).
- It's not a faulty cable, because I tested it with other cables. I usually use
HDMI cable, but with DisplayPort it's the same.
- It's not a faulty monitor, because I use it also with my laptop on a second
input.
- If I put my card into another computer with Windows, it works with
acceleration, like there's nothing wrong.
- But if I start my Tumbleweed with amdgpu drivers, then as soon as kernel
loads drm driver (so it's even before Xorg starts), the screen goes blank (the
monitor shows "no signal" and shuts off). It doesn't matter if I boot my
Tumbleweed with current or previous kernel. It doesn't matter if it's my
Tumbleweed or a Leap 15.4 booted from usb stick.

dmesg: https://paste.opensuse.org/pastes/c4df53bb0f7a
It says:
amdgpu 0000:09:00.0: [drm] Cannot find any crtc or sizes

Xorg.0.log: https://paste.opensuse.org/pastes/e9bd760602d1
It says:
(WW) AMDGPU(0): Unable to find connected outputs

I also tried:
- remove "quiet", remove "splash=silent", and append "plymouth.enable=0" (as
written at
https://en.opensuse.org/SDB:Nomodeset:_Work_Around_Graphic_Upgrade_&_Installation_Obstacles)
- nothing changed
- amdgpu.dc=0 - screen stays on, but shows nothing (just black) 

Reproducible: Always

Steps to Reproduce:
Just boot the system
Actual Results:  
Screen goes into suspend

Expected Results:  
Graphics on screen