[Bug 89143] New: Internal display goes blank when setting up external monitor as clone

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89143

            Bug ID: 89143
           Summary: Internal display goes blank when setting up external
                    monitor as clone
           Product: xorg
           Version: unspecified
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: nalimilan at club.fr
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 113488
  --> https://bugs.freedesktop.org/attachment.cgi?id=113488&action=edit
journalctl -e _COMM=Xorg.bin

This is on Fedora 21, with kernel 3.18.5, Xorg 1.16.3-2, Intel driver
2.99.916-3.20141117.

The GPU is an Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics &
Display [8086:0f31] (rev 0c)
lspci output here: https://bugzilla.kernel.org/attachment.cgi?id=165051

When connecting an external screen via VGA, and trying to set up as a clone of
the internal screen via the GNOME control center, the internal screen goes
blank, and only the external one is on. OTC, setting one screen as the main
one, and another as the secondary one works fine. If I set up the external
screen as the main one, and then set screens as clones of each other, the
external screen turns blank. So it looks like it's always the main screen which
turns blank.

Logs do not seem to contain any error messages.

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