[Bug 79994] New: intel-virtual-output: fatal IO error 9 when external display is enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79994

          Priority: medium
            Bug ID: 79994
          Assignee: chris at chris-wilson.co.uk
           Summary: intel-virtual-output: fatal IO error 9 when external
                    display is enabled
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: main.haarp at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Created attachment 100992
  --> https://bugs.freedesktop.org/attachment.cgi?id=100992&action=edit
i-v-o debug output

Greetings.

I'm using today's git of xf86-video-intel (but the same can be observed on
2.99.912). xorg-server-1.15.0. Gentoo Linux. Thinkpad W520 (SNB) with Nvidia
Quadro 2000M (handled via bumblebee).


I'm trying to get i-v-o to work. I can start the second X server on the
discrete GPU and have it enable the external display. It is disabled again when
I start i-v-o. so far so good.

Main X is on :0 and the secondary X on :8.

I now go ahead and enable the virtual output on :0
$ xrandr --output VIRTUAL1 --auto --right-of LVDS1

As soon as I do that, i-v-o crashes with:
XIO:  fatal IO error 9 (Bad file descriptor) on X server ":0.0"

Also see the attached log. There is nothing suspicious in either X's logfiles.
If you need any additional logs, let me know.

What's going on here? How can I help?

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