Hi,
I have a laptop with Intel HD4000 GPU which is connected to to the internal display and a Dell SP2309W display over HDMI. I used the instructions for Xinerama here to make this work:
http://intellinuxgraphics.org/dualhead.html
Xinerama is enabled and cloning disabled.
The server layout is:
{Internal Screen} {HDMI Screen}
I have also followed the instructions here:
https://bugs.launchpad.net/ubuntu/+s...nk/+bug/812594
and have acheived a working dual screen using a USB VGA adapter.
{Internal Screen} {USB Screen}
Now I would like to use both the Intel 4000 & the USB adapter to make a triple headed environment. The two external monitors are identical, Dell SP2309W (2048x1152) and the USB VGA adapter supports the resolution. Since I have all the components working correctly on their own I thought it would be a case of adding in the USB configuration, setting Screen 0 to be the USB adapter and aranging the server layout.
What I end up with is:
{Internal Screen} {USB Screen} {HDMI Screen, cloned from the Internal Screen}
The Interal Screen and the USB Screen have their correct resolutions
The HDMI Screen has a "negotiated" resolution of 1680x1050.
Distribution:
Linux Mint 13 / Maya, 64 bit Edition
# uname -a
Linux lhkg010ltp 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
I hope someone can help.
xorg.conf for the:
Code:
Section "ServerLayout"
Identifier "multihead"
Screen 0 "usbscreen" 1600 0
Screen 1 "laptopscreen" LeftOf "usbscreen"
Screen 2 "hdmiscreen" RightOf "usbscreen"
EndSection
Section "ServerFlags"
Option "Xinerama" "on"
Option "Clone" "off"
EndSection
Section "Device"
Identifier "vgacard"
Driver "intel"
Option "monitor-LVDS1" "laptop_monitor"
Option "monitor-HDMI1" "hdmi_monitor"
EndSection
Section "Device"
Identifier "usbcard"
Driver "displaylink"
Option "fbdev" "/dev/usbvideocard"
# The option above requires a special udev rule in /etc
EndSection
Section "Monitor"
Identifier "laptop_monitor"
EndSection
Section "Monitor"
Identifier "hdmi_monitor"
EndSection
Section "Monitor"
Identifier "usbmonitor"
EndSection
Section "Screen"
Identifier "laptopscreen"
Device "vgacard"
Monitor "laptop_monitor"
DefaultDepth 16
SubSection "Display"
Depth 16
Modes "1600x900"
EndSubSection
EndSection
Section "Screen"
Identifier "hdmiscreen"
Device "vgacard"
Monitor "hdmi_monitor"
DefaultDepth 16
SubSection "Display"
Depth 16
Modes "2048x1152"
EndSubSection
EndSection
Section "Screen"
Identifier "usbscreen"
Device "usbcard"
Monitor "usbmonitor"
DefaultDepth 16
SubSection "Display"
Depth 16
Modes "2048x1152"
EndSubSection
EndSection
