[Bug 80479] New: Log in not available after lock screen with multi-monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80479

          Priority: medium
            Bug ID: 80479
          Assignee: chris at chris-wilson.co.uk
           Summary: Log in not available after lock screen with
                    multi-monitor
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: bugs at mblankhorst.nl
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

Copied from launchpad.

After the screen locks I am unable to log back in because the screen with the
login prompt is black, and the screen on my laptop just shows the Ubuntu logo.

Furthermore, if I then unplug the external monitor (in an attempt to force the
log in option to be displayed on the laptop) the laptop screen then goes black
and I can't do anything at all.

I can't reproduce this if I select "lock screen" from the UI, but it happens
reliably if it locks due to inactivity.

Other info:
- I am running a fresh install of 14.04
- I have it set to lock after 5 min of inactivity, and require login after lock
- I have an external monitor, configured to be on the left side of the laptop
screen

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