[Bug 107793] Black screen on boot for Fedora 28 with 4.17 kernel (i.e. with amdgpu.dc defaulted)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107793

            Bug ID: 107793
           Summary: Black screen on boot for Fedora 28 with 4.17 kernel
                    (i.e. with amdgpu.dc defaulted)
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: simon.geard at gmail.com

Created attachment 141422
  --> https://bugs.freedesktop.org/attachment.cgi?id=141422&action=edit
Contents of /proc/cpuinfo on successful boot

My Fedora 28 desktop stopped booting up cleanly after switching to the 4.17
kernel where amdgpu.dc became the default... the system seems to be working
(e.g when installing updates, it automatically reboots once done), but the
screen goes black immediately after grub loads the kernel, and it remains that
way indefinitely. Passing "amdgpu.dc=0" on the kernel command line resolves the
problem.

The active graphics card is an AMD RX-470, the CPU is an AMD A10-7850k (with
unused onboard graphics).


This was logged on the RedHat bugzilla, but after receiving no response in over
a month, I've opted to log it here instead. Here's the link to the downstream
bug:

https://bugzilla.redhat.com/show_bug.cgi?id=1601812

I've re-attached the same files provided there – the output of lspci, dmesg,
and /proc/cpuinfo for a successful boot – but if you need anything else to
track this down, let me know.

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