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Houman
Asked: 2012-04-30 02:39:31 +0800 CST

Dual Monitors not detected in Ubuntu 12.04 (ATI Radeon HD)

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I am new to Ubuntu and really would like to replace Windows with it. One problem I am now running into is to make the second screen working.

I have an Optiplex 990, which comes with an internal Intel 2000 Graphic Card and an ASUS ATI Radeon HD 6570. Each graphic card is connected to one 24" monitor.

When I start Ubuntu 12.04 from USB stick, the boot menu shows on the Intel monitor. Then the Ubuntu....-loading-logo appears on the second Ati monitor. Then the actual Ubuntu workspace loads on the Intel monitor again and the ATI monitor goes into power save mode.

Doing this I get:

lspci | grep VGA

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Turks [Radeon HD 6570]

enter image description here

Therefore the screen you see here is only the intel driven one. The ATi one is forgotten.

I ended up installing the ATI driver from their website. and went through the steps as described here:

After installing it, I still get the following:

ubuntu@ubuntu:~/Downloads$ fglrxinfo

display: :0  screen: 0
OpenGL vendor string: Tungsten Graphics, Inc
OpenGL renderer string: Mesa DRI Intel(R) Sandybridge Desktop 
OpenGL version string: 1.4 (3.0 Mesa 8.0.2)

Which is expected, as my ATI connected screen is disabled.

Taking a glance at /etc/X11/xorg.conf

Section "ServerLayout"
        Identifier     "aticonfig Layout"
        Screen      0  "aticonfig-Screen[0]-0" 0 0
EndSection

Section "Module"
EndSection

Section "Monitor"
        Identifier   "aticonfig-Monitor[0]-0"
        Option      "VendorName" "ATI Proprietary Driver"
        Option      "ModelName" "Generic Autodetecting Monitor"
        Option      "DPMS" "true"
EndSection

Section "Device"
        Identifier  "aticonfig-Device[0]-0"
        Driver      "fglrx"
        BusID       "PCI:1:0:0"
EndSection

Section "Screen"
        Identifier "aticonfig-Screen[0]-0"
        Device     "aticonfig-Device[0]-0"
        Monitor    "aticonfig-Monitor[0]-0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
        EndSubSection
EndSection

I don't know what else I could do. Is here any pro that could help me solving this issue?

Many Thanks,

multiple-monitors ati intel-graphics 12.04

1 Answers

  1. You need to define your 2 screens in AMD soft.

    1. Open ATI driver application

      enter image description here

    2. and define your 2 screens display without any limit.

      amd settings

    3. and re-boot

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