[Bug 101849] New: No display after coming back from suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101849

            Bug ID: 101849
           Summary: No display after coming back from suspend
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: post+fdo at ralfj.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Every now and then, when I wake up my laptop from suspend, the display stays
black.  This seems happen when I start out working on an external screen (so
the laptop screen is disabled), then suspend the machine and unplug the
external screen (pretty much at the same time, I can't which happened first). 
Using Ctrl-Alt-F<N> to switch to other terminals still works, but Ctrl-Alt-F7
always brings up just a black screen.

I tried debugging this further, but did not get very far. The logs (dmesg,
journalctl, Xorg log) don't seem to contain anything useful, except for lots of
kscreen output (attached).  I tried to interact with the still-running X
session by setting DISPLAY and XAUTHORITY in another terminal.  "xrandr -q"
showed my laptop screen, including all its resolutions, as being turned off.  I
tried to turn it on ("xrandr --auto"), which failed saying

  xrandr: Configure crtc 0 failed

Again, I was unable to get any further details about this error from any logs.

Needless to say, this is an extremely disruptive bug; I lose my entire session
state of all running applications.

I have no idea which product and component to assign this to, so I figured I'd
start with the X server.

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