Disable laptop monitor at startup (when external monitor is connected)

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https://bbs.archlinux.org – I'd like to disable my laptop monitor at startup (when an external monitor is connected), but make it available in X.By default, my boot looks like :* Grub2 displays only on my external monitor (at maximum resolution)* Kernel displays only on my external monitor (maximum resolution)* udev (I think) is started and turns on my laptop screen. Then I get the same display cloned on both my monitors, at laptop resolution (leaving me with a small resolution on my external monitor).I can disable the laptop monitor by setting GRUB_CMDLINE_LINUX_DEFAULT="... video=LVDS-1:d" in /etc/defaul (HowTos)