> In gentoo > linux, everything seems to be working fine as far as I can tell, > except no sound comes out. cat /dev/urandom > /dev/dsp makes no > sound. > [...] > alsamixer: > PCM and Front, Front Mi, Surround, Center, LFE are all up and unmuted. > There is no Master volume. Line, Mic, Headphon are all muted and > down.
Some laptop sound chips require Headphone to be unmuted and / or a switch called "external amplifier" to be on to actually produce sound. If the chip can do digital out (even if there's no connector on the laptop), try turning it off. I think the mixer switch is called IEC-something. C.
