[Bug 91049] New: [Intel HD Graphics 4600] Output to external display causes issues

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91049

            Bug ID: 91049
           Summary: [Intel HD Graphics 4600] Output to external display
                    causes issues
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: ressu at ressukka.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 116639
  --> https://bugs.freedesktop.org/attachment.cgi?id=116639&action=edit
Xorg.log showing the various state changes before getting the display mirroring
going.

When using an external display on a HP ProBook 640 G1, the external works only
partially. The external display can reliably only be used as a mirrored
display. Switcing to any other mode is a hit and miss. Also disconnecting or
connecting external displays when X is running causes X to crash.

How to reproduce:

Example case 1:
- Connect an external display to the Docking station through DP port
- Start the computer
- Try to switch display mode from the keyboard (fn+F4)
- Observe the display state changes, the external display works only in a
mirrored mode

Example case 2:
- Start the computer (and allow it to boot to X)
- Connect an external display
- X Crashes

In the logs I used a Docking station to reproduce the problem, but the same
issue presents itself on the built in connectors as well.

Guesswork:
The reason why I reported this as a single issue and not 2 separate issues, is
that it looks like the Display identifiers are crossed somewhere. If I try to
turn off the internal display with xrandr, the external display will turn off
etc. This would cause the X server to get confused when a new display is
connected and cause it to crash. But this is just guesswork on my behalf.


The issue was reproduced with the following environment:

chipset: Intel HD Graphics 4600 (Integrated in the CPU I5-4200M)
system architecture: x86_64
xf86-video-intel/xserver/ version: 2:2.99.917-1~exp1ubuntu2build1 (From Ubuntu
15.04)
kernel version: 3.19.0-21-generic (From Ubuntu 15.04)
Linux distribution: Ubuntu 15.04
Machine or mobo model: HP ProBook 640 G1
Display connector: eDP and DP

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