[Bug 97916] New: Dual monitors unusable with DRI3 on Ivy Bridge

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97916

            Bug ID: 97916
           Summary: Dual monitors unusable with DRI3 on Ivy Bridge
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: john.lindgren at aol.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 126764
  --> https://bugs.freedesktop.org/attachment.cgi?id=126764&action=edit
X.org log with DRI3

Using Arch Linux x86_64 with:
linux 4.7.4-1
xorg-server 1.18.4-1
xf86-video-intel 1:2.99.917+703+g15c5ff1-1
xfwm4 4.12.3-2
compton 0.1_beta2.5-3

With default settings (no xorg.conf), dual monitors can only be used in "clone"
mode.  When trying to switch to "extend" mode, the right-hand display freezes
and continues to display a snapshot of the cloned display contents at the time
of the switch.  Using Option "DRI" "2" in xorg.conf is a workaround.

My system is a Dell Latitude E5530 (Core i5 3210m).  The left-hand monitor in
this case is the laptop display and the right-hand monitor is an Acer external
display connected to the docking station with a DVI cable.

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