[Bug 72795] [HSW dp mst] Dell dock DVI knocks out DP when unplugged.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72795

--- Comment #12 from oss+freedesktop at x-net.be ---
I also have a Dell Latitude E7440, with two 1600x1200 monitors connected via
Display Port to a Dell PR02X dock. I can not get both monitors to work in dual
head. They do work in mirror mode. It seems as if only one Display Port is
visible to the operating system. The 3840x1200 resolution on DP1 works as well,
the image is then stretched over both monitors.

Previously, I had a Dell Latitude E6410 in the same dock with the same two
monitors, using the nouveau driver. That worked flawlessly. I still have that
laptop around for a few more days. If required, I can provide more info on that
one.

The relevant output of xrandr, lspci and dmesg can be found below. My Xorg.log
file will follow in attachment.

$ uname -a
Linux something 3.13.5-1-ARCH #1 SMP PREEMPT Sun Feb 23 00:25:24 CET 2014
x86_64 GNU/Linux

$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated
Graphics Controller (rev 0b)

$ xrandr 
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 32767 x 32767
eDP1 connected (normal left inverted right x axis y axis)
   1920x1080      60.0 +
   1400x1050      60.0  
   1280x1024      60.0  
   1280x960       60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis)
519mm x 324mm
   1920x1200      60.0*+
   3840x1200      60.0  
   2560x1024      60.0  
   1600x1200      60.0  
   1680x1050      60.0  
   1280x1024      60.0  
   1280x960       60.0  
   1280x720       60.0  
   1024x768       60.0  
   800x600        60.3  
   640x480        60.0     59.9  
   720x400        70.1  
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

$ dmesg | grep "drm\|i915"
[    3.331548] [drm] Initialized drm 1.1.0 20060810
[    3.541956] [drm] Memory usable by graphics device = 2048M
[    3.541960] fb: conflicting fb hw usage inteldrmfb vs VESA VGA - removing
generic driver
[    3.605122] i915 0000:00:02.0: irq 64 for MSI/MSI-X
[    3.605132] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    3.605133] [drm] Driver supports precise vblank timestamp query.
[    3.939314] fbcon: inteldrmfb (fb0) is primary device
[    4.959278] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    4.959280] i915 0000:00:02.0: registered panic notifier
[    5.314564] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
[    5.614409] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor
0
[    9.521807] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting

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