Arch Linux

Description: After update of amd-ucode 20230625.ee91452d-1 -> 20230625.ee91452d-2 my HP Envy 360 laptop with AMD Ryzen 7 4700U with Radeon Graphics boots, but the graphics (amdgpu) fails to display sddm greeter

Additional info:
* package version(s) amd-ucode 20230625.ee91452d-1 -> 20230625.ee91452d-2
* config and/or log files etc. Attached journal and dmidecode for the laptop
* link to upstream bug report, if any

Steps to reproduce:
Update amd-ucode 20230625.ee91452d-1 -> 20230625.ee91452d-2 and reboot. System boots, but although the console shows graphical target reached, the display remains blank. Downgrading back to amd-ucode 20230625.ee91452d-1 the system boots normally and the sddm greeter display shows on the screen as normal.

Likely key section of journal showing amdgpu is no longer loading normally and has a Fatal error is in this section of the log:

Jun 30 23:28:29 ryzen1 kernel: [drm] initializing kernel modesetting (RENOIR 0x1002:0x1636 0x103C:0x876F 0xC2).
Jun 30 23:28:29 ryzen1 kernel: [drm] register mmio base: 0xD0400000
Jun 30 23:28:29 ryzen1 kernel: [drm] register mmio size: 524288
Jun 30 23:28:29 ryzen1 kernel: [drm] add ip block number 0 <soc15_common>
Jun 30 23:28:29 ryzen1 kernel: [drm] add ip block number 1 <gmc_v9_0>
Jun 30 23:28:29 ryzen1 kernel: [drm] add ip block number 2 <vega10_ih>
Jun 30 23:28:29 ryzen1 kernel: [drm] add ip block number 3 <psp>
Jun 30 23:28:29 ryzen1 kernel: [drm] add ip block number 4 <smu>
Jun 30 23:28:29 ryzen1 kernel: [drm] add ip block number 5 <dm>
Jun 30 23:28:29 ryzen1 kernel: [drm] add ip block number 6 <gfx_v9_0>
Jun 30 23:28:29 ryzen1 kernel: [drm] add ip block number 7 <sdma_v4_0>
Jun 30 23:28:29 ryzen1 kernel: [drm] add ip block number 8 <vcn_v2_0>
Jun 30 23:28:29 ryzen1 kernel: [drm] add ip block number 9 <jpeg_v2_0>
Jun 30 23:28:29 ryzen1 kernel: amdgpu 0000:04:00.0: amdgpu: Fetched VBIOS from VFCT
Jun 30 23:28:29 ryzen1 kernel: amdgpu: ATOM BIOS: 113-RENOIR-037
Jun 30 23:28:29 ryzen1 kernel: amdgpu 0000:04:00.0: Direct firmware load for amdgpu/renoir_asd.bin failed with error -2
Jun 30 23:28:29 ryzen1 kernel: [drm:amdgpu_device_init [amdgpu]] *ERROR* early_init of IP block <psp> failed -19
Jun 30 23:28:29 ryzen1 kernel: amdgpu 0000:04:00.0: Direct firmware load for amdgpu/renoir_dmcub.bin failed with error -2
Jun 30 23:28:29 ryzen1 kernel: [drm:dm_early_init [amdgpu]] *ERROR* DMUB firmware loading failed: -19
Jun 30 23:28:29 ryzen1 kernel: [drm:amdgpu_device_init [amdgpu]] *ERROR* early_init of IP block <dm> failed -19
Jun 30 23:28:29 ryzen1 kernel: amdgpu 0000:04:00.0: Direct firmware load for amdgpu/renoir_pfp.bin failed with error -2
Jun 30 23:28:29 ryzen1 kernel: [drm:amdgpu_device_init [amdgpu]] *ERROR* early_init of IP block <gfx_v9_0> failed -19
Jun 30 23:28:29 ryzen1 kernel: amdgpu 0000:04:00.0: Direct firmware load for amdgpu/renoir_sdma.bin failed with error -2
Jun 30 23:28:29 ryzen1 kernel: [drm:sdma_v4_0_early_init [amdgpu]] *ERROR* Failed to load sdma firmware!
Jun 30 23:28:29 ryzen1 kernel: [drm:amdgpu_device_init [amdgpu]] *ERROR* early_init of IP block <sdma_v4_0> failed -19
Jun 30 23:28:29 ryzen1 kernel: [drm] VCN decode is enabled in VM mode
Jun 30 23:28:29 ryzen1 kernel: [drm] VCN encode is enabled in VM mode
Jun 30 23:28:29 ryzen1 kernel: amdgpu 0000:04:00.0: Direct firmware load for amdgpu/renoir_vcn.bin failed with error -2
Jun 30 23:28:29 ryzen1 kernel: [drm:amdgpu_device_init [amdgpu]] *ERROR* early_init of IP block <vcn_v2_0> failed -19
Jun 30 23:28:29 ryzen1 kernel: [drm] JPEG decode is enabled in VM mode
Jun 30 23:28:29 ryzen1 kernel: amdgpu 0000:04:00.0: amdgpu: Fatal error during GPU init
Jun 30 23:28:29 ryzen1 kernel: amdgpu 0000:04:00.0: amdgpu: amdgpu: finishing device.

Since downgrading amd-ucode back to amd-ucode 20230625.ee91452d-1 resolves the problem this points to a bug in the version of amd-ucode 20230625.ee91452d-2

The system is fully up to date running kernel 6.4.0