Hello,
 i've got :
```
Dec 10 16:54:18 hp kernel: [drm:construct [amdgpu]] *ERROR* construct: Invalid
Connector ObjectID from Adapter Service for connector index:2!
Dec 10 16:54:19 hp kernel: [drm:hwss_wait_for_blank_complete [amdgpu]] *ERROR*
DC: failed to blank crtc!  lete [amdgpu]] *ERROR* DC: failed to blank crtc!
```
during the boot after i upgraded from latest fedora kernel to
4.15.0-0.rc2.git2.2

the great part about this kernel that amd Carruzo finally (almost) working. I
still don't get to boot into X. but at least i have terminals on init3 now.

X - https://paste.fedoraproject.org/paste/9VAWjgZgfELNKisxYSXEpw
boot - https://paste.fedoraproject.org/paste/8A4R4fYX09Rke~5UZcTqZQ

i used Kelly's kernel config
(https://bugs.freedesktop.org/show_bug.cgi?id=95306#c74):
```
CONFIG_DRM_AMD_DC=y
CONFIG_DRM_AMD_DC_PRE_VEGA=y
# CONFIG_DRM_AMD_DC_FBC is not set
CONFIG_DRM_AMD_DC_DCN1_0=y
# CONFIG_DEBUG_KERNEL_DC is not set
```