[alsa-devel] Subwoofers aren't working on ALC298 (Lenovo Yoga C930 Laptop)

[Daniel James]

Hi Jonathan,

> - Running hdajackretask, from the alsaTools package. It seems to 
> correctly recognize that there are some unassigned pins, and even gives 
> me the option of assigning them to "internal speaker (LFE)," which 
> sounds like it could be a bass output.

LFE usually stands for Low Frequency Effects, i.e. a subwoofer channel 
on a movie or game. There are some tips on surround sound at 
http://www.volkerschatz.com/noise/alsa.html

I don't know which 'md' program they are referring to, but you can 
install tee separately.

Cheers!

Daniel