How to connect 2 monitors on Ubuntu 12.04?

Question

linux

Good day
For the second week I've been struggling with the task that our favorite distribution kit presented to me.
Given:

• Ubuntu 12.04LTS
  
• Nvidia GeForce GT 430
  
• Bus Type: PCI Express x16 Gen1
  
• Bus ID: PCI:1:0:0
  

2 completely identical working monitors:

• LG Electronics E2241 (DFP-0)
  
• LG Electronics E2241 (CRT-1)
  

Connected to graphics card
Operating System: Linux-x86_64
NVIDIA Driver Version: 295.40
Server Version Number: 11.0
Monitors connected in TwinView
xrandr configuration :

[email protected]:~$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 3840 x 1080, current 3840 x 1080, maximum 3840 x 1080
default connected 3840x1080+0+0 0mm x 0mm
   3840x1080      50.0     51.0*

xorg,conf

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 295.33  ([email protected])  Fri Mar 30 15:25:24 UTC 2012

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "LG Electronics E2241"
    HorizSync       30.0 - 83.0
    VertRefresh     56.0 - 75.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GT 430"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "1"
    Option         "TwinViewXineramaInfoOrder" "DFP-0"
    Option         "metamodes" "CRT: nvidia-auto-select +1920+0, DFP: 1920x1080_60_0 +0+0; CRT: nvidia-auto-select +1920+0, DFP: nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Problem:
The monitor working on DFP-0 perfectly transfers the picture, but the one that was supposedly determined by CRT-1 constantly ripples, creating a full-fledged epilepsy attack when working for a long time.
Any cable connected to this connector works the same way.
Checked on Debian 6 - same effect.
Need help

Answer 1

And CRT is a type of analog connection (D-SUB)? A DFP-digit?
If so, then the analog signal may be suffering from interference. It was on an external monitor for a laptop. The ripples were terribly annoying. When connected via DVI / HDMI - everything became cool.
I looked at the NV website, this card seems to have both DVI and HDMI. Try connecting both monitors digitally.

Answer 2

and under Windows did not check?

Answer 3

What is the resolution of the monitor? my vga (d-sub) full-hd also rippled hard, I connected the hmdi-dvi adapter to the dvi monitor output and everything worked well! True, I have Intel graphics and a laptop, but it can still wiggle like that ...

Answer 4

As a result, everything was decided by buying an hdmi 2 dvi cable. Issue closed, thanks everyone.