LinuxQuestions.org - Matching display in xorg.conf by its model or by graphics adapter

Hi. I have a dual boot system: Archlinux and Windows from which I boot the same Arch in Virtualbox.

I have 2 displays:
- 1440x768
samsung syncmaster 920nw
pc---dvi port---dvi/vga adapter---vga cable---vga port---display

- 1920x1080
samsung s24c350bl
pc---hdmi port---hdmi/dvi cable---dvi port---dispaly

Arch fails to recognize the right resolution 1440x768 and allows only 1024x768.
I'm following this post https://bbs.archlinux.org/viewtopic....803924#p803924
I've obtained the modeline config for it:

Code:

"1440x900" 106.670 1440 1520 1672 1904 900 901 904 932 -hsync -vsync

and added it to /etc/X11/xorg.conf.d/10-monitor.conf :

Code:

Section "Monitor"

    Identifier          "Monitor0"

    ModelName          "SyncMaster 920NW"

    VendorName          "Samsung"

    ModeLine            "1440x900" 106.670 1440 1520 1672 1904 900 901 904 932 -hsync -vsync

EndSection





Section "Screen"

    Identifier          "Screen0"

    Monitor            "Monitor0"

    SubSection "Display"

    EndSubSection

EndSection

For the big virtual screen I also have:

Code:

~/.config/autostart/multihead.desktop:

Exec=xrandr --output VGA1 --auto --output HDMI2 --auto --right-of VGA1

This all works. Now the question: how do I make an entry in xorg.conf match syncmaster 920nw when I boot physically, but not match the virtual display when I boot from Virtualbox?
In both cases they will be "Monitor0".