How to get two monitors working in Linux?

[Ben Bucksch]

On 28.12.2011 03:34, monitorxxx wrote:
> Hi, I have Arch Linux in this system:
>
> -video card: nvidia 6150
> -monitor 1: LG, 1440x900 (right side)
> -monitor 2: Samsung, 1360x760 (left side)
> -desktop environment: Lxde
>
> 1) no matter how hard I try, write to xorg.conf, set up and reboot, the
> monitors' positions are always changed in NVIDIA X Server Settings (the
> graphical tool).

I am using the open-source nouveau driver, not the nvidia driver from 
the vendor. Don't even use the "NVIDIA X Server Settings", esp. if it 
causes trouble.

I propose you use

  * software: A fairly new X11 (1 year old is OK)
  * config: No xorg.conf at all
  * driver: This should load "nouveau" for your card. Verify by reading
    /var/log/Xorg.0.log carefully (it's confusing at first)
  * xrandr: Your monitors will by default both show the same picture.
      o In GNOME, you could run Settings | Screen settings, LXDE should
        have LXRandR, which gives you a GUI tool to configure xrandr.
        But the change will unfortunately not be permanent.
      o In a terminal inside the running X11, run "xrandr". That shows
        you your monitors, their connection names (before "connected",
        e.g. "DVI-I-1" or "VGA"), and their resolutions.
      o Again in a terminal in X11, run something like "xrandr --auto
        --output DVI-I-2 --right-of DVI-I-1". You should see the result
        immediately. If it works, put that line in
        /etc/X11/Xsession.d/45custom_xrandr-settings and chmod 755 that
        file. Restart X11 and the monitors should still be in this config.

For more info, just search the web for "xrandr"
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