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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Intel HD Graphics 4600] Output to external display causes issues"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91049">91049</a>
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<th>Summary</th>
<td>[Intel HD Graphics 4600] Output to external display causes issues
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<th>Product</th>
<td>xorg
</td>
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>Driver/intel
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
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<th>Reporter</th>
<td>ressu@ressukka.net
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<pre>Created <span class=""><a href="attachment.cgi?id=116639" name="attach_116639" title="Xorg.log showing the various state changes before getting the display mirroring going.">attachment 116639</a> <a href="attachment.cgi?id=116639&action=edit" title="Xorg.log showing the various state changes before getting the display mirroring going.">[details]</a></span>
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</pre>
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