Here are some settings specific for the Raspberry PI.
The sound is propagrated through the HDMI. Install the following packages:
pacman -S alsa-utils alsa-firmware alsa-lib alsa-plugins
To enforce an output source, use the following command:
amixer cset numid=3 $NUM
Where NUM can be of the following values:
Some versions of Archlinux ARM may cause the server to not be able to complete boot unless directly plugged with an HDMI output. It is possible to force the boot to finish thanks to a hidden option that fakes the existence of a HDMI output even if not directly plugged in, thanks to this option set in /boot/config.txt:
hdmi_force_hotplug=1
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