A hint to detect the current state of the monitors - maybe this can be
used to ease the setup/switching of external monitors:

On my thinkspad a file in /proc displays the state of my monitors.

0.) Switch the external monitor on
    by entering Fn + F7 (switch monitor icon)

    [EMAIL PROTECTED]: $ cat /proc/acpi/ibm/video
    status:         supported
    lcd:            enabled
    crt:            disabled
    dvi:            disabled
    auto:           enabled
    commands:       lcd_enable, lcd_disable
    commands:       crt_enable, crt_disable
    commands:       dvi_enable, dvi_disable
    commands:       auto_enable, auto_disable
    commands:       video_switch, expand_toggle

1.) Switch the external monitor on
    by entering Fn + F7 (switch monitor icon)

    [EMAIL PROTECTED]: $ cat /proc/acpi/ibm/video
    status:         supported
    lcd:            enabled
    crt:            enabled
    dvi:            disabled
    auto:           enabled
    commands:       lcd_enable, lcd_disable
    commands:       crt_enable, crt_disable
    commands:       dvi_enable, dvi_disable
    commands:       auto_enable, auto_disable
    commands:       video_switch, expand_toggle

-- 
Feature Request: Dynamic head configuration in X.org
https://bugs.launchpad.net/bugs/86301
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