Dual Monitor Support

[alexmasis]

Hi, I have on Ubuntu 12.04 and I have 2 external monitors connected via port replicator, the laptop monitor is not used.
The 2 monitors are mirrowed fine, but I can't extend the display, as I was able to do before I loaded all latest updates...
Here are some details about my setup:

# lspci | grep VGA

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)

# xrandr
Screen 0: minimum 320 x 200, current 1680 x 1200, maximum 8192 x 8192
LVDS1 connected (normal left inverted right x axis y axis)
1366x768 60.0 +
1360x768 59.8 60.0
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
VGA1 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm
1680x1050 60.0*+ 74.9
1600x900 60.0
1280x1024 75.0 72.0 60.0
1440x900 75.0 59.9
1152x864 75.0
1024x768 75.1 70.1 60.0
800x600 72.2 75.0 60.3
640x480 72.8 75.0 66.7 60.0
720x400 70.1
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 367mm x 275mm
1600x1200 60.0*+
1280x1024 75.0 60.0
1152x864 75.0
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)

In the "Settings/Settings Manager/Display" I have selected to use the output for 2 external monitors, the laptop monitor is not used.

# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.3 LTS
Release: 12.04
Codename: precise


I also tried the disper app, but it has an error:
#disper -e
There is no matching crtc for the output

[oldos2er]

Moved to Absolute Beginners.

[newb85]

And if you un-check the "Mirror Displays" box in Displays, it doesn't accomplish what you want?