P150HM, subwoofer and linux

Hi,

I have been trying to figure out how to get the subwoofer working under linux. I have already learned that under Windows THX TruStudio PRO's "speaker" program needs to be enabled for the sub to produce any sound. Does anyone have any idea what is this program actually doing? If I relay this information to alsa/pulseaudio developers they might be able to get it working.
On a related note, is THX TruStudio PRO required to make the sub work on P170HM too?

 

i got mine working without thx. Just the audio drivers. But i am under windows.

Turn the machine sideways and have your ear close to the sub and see if its working.

 

Well, it might be a technicality, but if you need to put your ear next to the sub to hear it, it isn't really "working", is it?

 

Hey,

What distro are you running? Pulse audio defaults to 2 channels, so if you have more then that on your P170HM, you're going to have to enable surround... If you're using one of the more recent debian distros, there should be an option inside your volume control to enable multiple channels.

Try this:

Code:

sudo apt-get install alsamixer

Run

Code:

alsamixer

in the terminal and see if you have a sub channel you can turn on / turn up... if not, try truncating the following file:

Code:

gksudo gedit /etc/modprobe.d/alsa-base.conf

Add this to the bottom:

Code:

options snd-hda-intel model=auto 

Restart, and try again.

All of this is assuming you're running some debian-based distro.

 

I am running Fedora 16. I would like to clarify that the problem here is with the internal subwoofer - the external jack works fine, there is a LFE control in alsamixer and all that (there is an option to select 2, 4 and 6 channel sound, 8 channels are missing due to pin 0x17 not being announced by BIOS).
With the help of alsa-devel list members I was able to narrow down that the internal sub is connected to pin 0x16 most likely (also not announced by BIOS, but there are not that many pins left), but I have a reason to believe I cannot hear anything due to processing which is being done by THX TruStudio PRO not existing under linux.