https://bugs.freedesktop.org/show_bug.cgi?id=111228

            Bug ID: 111228
           Summary: PRIME output screen satys black on 1002:15d8 with
                    128MB VRAM
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: hhfeuer@gmx.de

So far I met the same PCI ID 1002:15d8 with 2GB VRAM which was working fine in
prime output mode with any nvidia gpu as provider. The mentioned version with
128MB VRAM doesn't work. No error messages regarding prime, just the screen
staying black.
https://devtalk.nvidia.com/default/topic/1056652/linux/amd-ryzen-7-geforce-gtx-1660-ti-laptop-gt-cannot-get-nvidia-to-be-used-as-primary-graphics/1

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