Arch Linux: no sound from speakers, headphones OK

As noted here, you must tell the system that you’re using a laptop, so there are several outputs. Edit /etc/modprobe.d/50-sound.conf (or similar) like this:

alias snd-card-0 snd-hda-intel
alias sound-slot-0 snd-hda-intel

options snd-hda-intel model=hp

EDIT: for more models and options, see this Ubuntu Wiki page.

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