[Bug 109959] New: REGRESSION: black screen with linux 5.0 when starting X

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109959

            Bug ID: 109959
           Summary: REGRESSION: black screen with linux 5.0 when starting
                    X
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: aacid at kde.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 143621
  --> https://bugs.freedesktop.org/attachment.cgi?id=143621&action=edit
said file with drm.debug=14

As mentioned in https://bugs.freedesktop.org/show_bug.cgi?id=105267 the patch
introduced to fix that makes my screen black when trying to start X (i can see
the boot messages)

This https://invent.kde.org/snippets/44 workarounds the issue for me.

dmesg with drm.debug=14 attached

laptop is a Dell XPS 15 9570

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