[Bug 111769] New: DP-1-2-8 driven at boot, off in X, driven at shutdown

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111769

            Bug ID: 111769
           Summary: DP-1-2-8 driven at boot, off in X, driven at shutdown
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: not set
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: tony at linx.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

On my Dell XPS 9560, and Linus post-5.3 git tree, my Dell U3415W is no longer
driven from X. The screen goes into standby, and attempting to use it shows:
$ xrandr --output DP-1-2-8 --above eDP-1 --auto
xrandr: cannot find crtc for output DP-1-2-8

Note that the screen lights up during boot, as it always did. Once lightdm is
started, the screen turns off. When I shut the machine down and X terminates,
the screen lights back up.

I will be adding attachments shortly.

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