[Bug 106397] New: No display on my monitor if i plug in the VGA cable after entering os

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106397

            Bug ID: 106397
           Summary: No display on my monitor if i plug in the VGA cable
                    after entering os
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: qnyh68 at 163.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 139331
  --> https://bugs.freedesktop.org/attachment.cgi?id=139331&action=edit
dmesg with drm.debug=0x1e from the boot to failure

Sorry, I think I need to reopen this bug.
Bug id=104330

If my operating system is CentOS 7.3 or update to kernel 4.16.7-1, it is
normal. 
But when my operating system is CentOS 7.4 or update to kernel 4.16.7-1, it is
normal. With kernel 4.16.7-1, when I plug in the VGA cable after entering os,
the screen stops on the background but no login interface. See the picture of
attachment.
I also send

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