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Kei

Member

Registered: 2007-04-05

Posts: 88

Strange dual screen issue with HP Folio 1040 and docking station

Hi there,

I have a laptop in a docking station. Two displays are connected using the docking station's DisplayPorts. Instead of showing me two separate displays like I'd have expected, xrandr seems to "see" only one large screen.

Laptop: HP EliteBook Folio 1040 with Intel HD 4400 graphics card
Docking station: HP 2013 UltraSlim Docking Station

$ xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 173mm
   1920x1080     60.05*+  40.03  
   1400x1050     59.98  
   1280x1024     60.02  
   1280x960      60.00  
   1024x768      60.00  
   800x600       60.32    56.25  
   640x480       59.94  
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 287mm
   1920x1080     60.00*+  59.94  
   3840x1080     60.00  
   2560x1024     60.00  
   1680x1050     59.95  
   1280x1024     60.02  
   1280x960      60.00  
   1280x720      59.97  
   1024x768      60.00  
   800x600       60.32  
   640x480       60.00    59.94  
   720x400       70.08  
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

eDP1 is the laptop's built-in display, while DP2 seems to represent _both_ displays. When I select 1920x1080, the two displays show the same. When I select 3840x1080, however, the two displays show a side-by-side setup, such that X11 spans over both of them. While I'm happy that I'm now able to make use of the second display, this obviously breaks some software stuff, like fullscreen video in vlc, for example. Any suggestions what I can do about that? Is it possible to software-split the screen such that it looks like a normal dual-head setup again?

Additional info:

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

$ X -version
X.Org X Server 1.15.1
Release Date: 2014-04-13
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.14.0-4-ARCH x86_64 
Current Operating System: Linux elite 3.14.6-1-ARCH #1 SMP PREEMPT Sun Jun 8 10:08:38 CEST 2014 x86_64
Kernel command line: initrd=\initramfs-linux.img root=PARTUUID=88c068f1-bc0b-45b0-8836-182c29fe9b41 rw quiet
Build Date: 14 April 2014  08:39:09AM
Current version of pixman: 0.32.4

$ pacman -Qi intel-dri xf86-video-intel | grep Version
Version        : 10.2.1-1
Version        : 2.99.911-2

emeres

Member

Registered: 2013-10-08

Posts: 1,570

Re: Strange dual screen issue with HP Folio 1040 and docking station

You could define two screens in xorg.conf similar to last post here. You would have to select the screen using the -display switch or the DISPLAY variable when using xrandr.