[Bug 106940] Black screen on KMS with 4.18.0-rc1 with Kaveri+Topaz, amdgpu, dc=1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106940

            Bug ID: 106940
           Summary: Black screen on KMS with 4.18.0-rc1 with Kaveri+Topaz,
                    amdgpu, dc=1
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: nmset at netcourrier.com

Since kernel 4.18.0-rc1, my laptop boots in a black screen with Kaveri+Topaz
GPUs, Xorg 1.20.0. The systems boots normally in the background. I can log in
blindly in sddm, press CTRL+ALT+DEL when KDE has booted invisibly and shutdown
the laptop with ENTER. I'm using the following options :

install radeon /bin/false
options amdgpu dc=1 si_support=1 cik_support=1
options radeon si_support=0 cik_support=0

Everything was just working until 4.18.0-rc1.

If I boot on another partition, I can inspect Xorg.0.log of the main partition,
which contains no errors.

With no options at all, or if dc=0, I can get a KDE usable session, excepting
suspend failing quite often.

Thanks for any input to resolve this. I can give more information upon your
instructions.

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