https://bugs.freedesktop.org/show_bug.cgi?id=104194

            Bug ID: 104194
           Summary: HDMI with RX460 not working on linux 4.15-rc2 with DC
                    enabled and linux-amd-staging-drm-next
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: laichiaheng@outlook.com

Graphics: Card: Advanced Micro Devices [AMD/ATI] Baffin [Radeon RX 460/560D /
Pro 450/455/460/560] 
Display Server: x11 (X.Org 1.19.5 ) driver: amdgpu Resolution:
1920x1080@60.00hz 
OpenGL: renderer: AMD Radeon RX 460 Graphics (POLARIS11 / DRM 3.23.0 /
4.15.0-rc2-mainline, LLVM 6.0.0) 
version: 4.5 Mesa 17.4.0-devel (git-4c7af87fb9)


GRUB_CMDLINE_LINUX_DEFAULT="quiet amdgpu.dc=1"


Nothing is output to the HDMI when amdgpu.dc is enabled

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