[Bug 73850] New: [[GM45] xrandr] allow cloning one display together with an extended desktop across two displays

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73850

          Priority: medium
            Bug ID: 73850
          Assignee: chris at chris-wilson.co.uk
           Summary: [[GM45] xrandr] allow cloning one display together
                    with an extended desktop across two displays
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: julius.schwartzenberg at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

My system has three outputs: LVDS1, VGA1 and HDMI1

Normally I have LVDS1 and VGA1 active at the same time. Now I would like to
clone HDMI1 with either LVDS1 or VGA1. When I run either,
xrandr --output HDMI1 --same-as LVDS1
or,
xrandr --output HDMI1 --same-as VGA1

nothing happens however.
The command is completely ignored and nothing is output over HDMI1.

I would expect the command to clone the part of the extended desktop on either
LVDS1 or VGA1 to HDMI1.

I'm running Ubuntu 12.04 with kernel version 3.11.0, X.Org version 1.11.4 and
X.Org driver version 2.99.905-git201401200348~ubuntu12.04.1 with a G45 chip.

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