[Bug 91049] New: [Intel HD Graphics 4600] Output to external display causes issues
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Sun Jun 21 23:50:46 PDT 2015
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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