Booting with AMD GPU (RX5500 XT) not working

[onterof]

I’ve just recently got my hands on a reasonable priced RX5500 XT to replace my old Nvidia GTX1070.
So i thought it would just be plug & play for amd cards.

But after pluggin it in my system doesn’t even want to boot. It just gets stuck somewhere in the boot process and hangs indefinetly. Using different kernels 5.9, 5.10, 5.11 & 5.12rc no chances …

Using nomodeset i can boot into a tty but i can’t figure out what is going on with the amd driver.

To verify that the problem is not something from my installation, I tried booting from a live usb (lastest manjaro gnome edition) but that aswell doesn’t work, which slowly makes me think that I’ve might have gotten a defective gpu unit

My System:
MSI MPG B550 MB
Ryzen 5 3600
RX 550 XT
16GB RAM

[onterof]

Update: I was able to find the problem via journaltcl …

Mär 19 08:57:32 andre-pc kernel: amdgpu 0000:2d:00.0: amdgpu: SMU driver if version not matched
Mär 19 08:57:32 andre-pc kernel: amdgpu 0000:2d:00.0: amdgpu: use vbios provided pptable
Mär 19 08:57:32 andre-pc kernel: amdgpu 0000:2d:00.0: amdgpu: smc_dpm_info table revision(format.content): 4.5
Mär 19 08:57:32 andre-pc kernel: amdgpu 0000:2d:00.0: amdgpu: message: EnableAllSmuFeatures (6) param: 0x00000000 is timeout (no response)
Mär 19 08:57:32 andre-pc kernel: amdgpu 0000:2d:00.0: amdgpu: Failed to enable requested dpm features!
Mär 19 08:57:32 andre-pc kernel: amdgpu 0000:2d:00.0: amdgpu: Failed to setup smc hw!
Mär 19 08:57:32 andre-pc kernel: [drm:amdgpu_device_init.cold [amdgpu]] ERROR hw_init of IP block failed -62
Mär 19 08:57:32 andre-pc kernel: amdgpu 0000:2d:00.0: amdgpu: amdgpu_device_ip_init failed
Mär 19 08:57:32 andre-pc kernel: amdgpu 0000:2d:00.0: amdgpu: Fatal error during GPU init
Mär 19 08:57:32 andre-pc kernel: amdgpu: probe of 0000:2d:00.0 failed with error -62

Turns out setting amdgpu.dpm=0 did the trick