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

[Jonathan Reeve]

Hi Daniel,

I'm guessing I shouldn't assign this pin to LFE, then? And maybe 
assign
it to "internal speaker (back)"? I'm at a loss for knowing what to
assign to what.

But this is all moot, since the real problem, it seems to me, is 
that
clicking "apply now" or "install boot override" won't work on 
NixOS.
The first issue is that `hdajackretask` apparently can't find my 
copies
of `tee` and `mv`. I can run these programs just fine from a 
shell, and
`which tee` shows their locations in NixOS:
`/run/current-system/sw/bin/tee`, but `hdajackretask` can't find 
them,
for some reason, and `Apply now` fails. The second is that, even 
if I
run run the /tmp script manually, nothing seems to change with my
system. I have a feeling `hdajackretask` needs to do something 
beyond
what is in the `/tmp` script, and that it can't do that, since it 
can't
find my system utilities.

Thanks for that link, though—there's some useful stuff in there.

Are there other ways of connecting unused pins that don't use
hdajackretask? Like a script I can run or a sequence of commands?

Best,

Jonathan

Daniel James <daniel at 64studio.com> writes:

> 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