Similar problem on HP nx7300. No sound from speakers, headphones are ok. Red light on the mute button is on.
The number of mixer controls is reduced to four:
$ amixer scontrols
Simple mixer control 'Headphone',0
Simple mixer control 'PCM',0
Simple mixer control 'Digital',0
Simple mixer control 'Speaker',0
Similar problem on HP nx7300. No sound from speakers, headphones are ok. Red light on the mute button is on.
The number of mixer controls is reduced to four:
$ amixer scontrols
Simple mixer control 'Headphone',0
Simple mixer control 'PCM',0
Simple mixer control 'Digital',0
Simple mixer control 'Speaker',0