[alsa-devel] [Alsa-user] Impossible to make subwoofer work on a Dell XPS M1710w

Tobin Davis tdavis at dsl-only.net
Sun Aug 19 18:06:23 CEST 2007

I was looking over some other Dell INF files, and found a newer pin def
listing for this system.  Try this patch and see if it fixes your
Center/LFE settings.


On Sun, 2007-08-19 at 15:31 +0200, Michael Gerdau wrote:

> > Do you mean a problem with the missing LFE?  The missing LFE sounds
> > like a different problem.  AFAIK, the device itself _is_ set up
> > properly as expected.
> I mean the missing LFE.
> I can confirm the device otherwise works as adverticed. In fact I only
> (kind of) miss the LFE since I read in another post it should be there :-)
> > And, if it's about debugging, let's discuss on alsa-devel ML and drop
> > Cc from alsa-users.
> I've run the current alsa-info.sh as suggested by Tobis Davis (thanks
> for the pointer BTW) and had it upload the result automatically.
> > Why not patch the code :)
> That was my first idea :)
> When I boldly started looking at it I realized I'm in for a steep learning
> curve. Not that I won't walk that road, but it will take me some time...
> For a start I downloaded "Writing an alsa driver" and alsa-driver-api and
> will start reading it "real soon" (TM)
> > As a hint, if it's really a regression, try to revert to the version
> > it did work.  Check /proc/asound/card0/codec#* file to see which
> > widget is changed by the LFE volume.  That's the vital information.
> I don't know whether it actually is a regression or a not-yet-implemented
> feature. I do own my XPS M1710 since around March/April 2007 and I don't
> recall to have seen it. However sound worked right from the start and until
> recently I wasn't even aware there should be a LFE control. In fact the
> only "evidence" I have there should be one is already mentioned other post.
> That having said:
> The link http://bulletproof.servebeer.com/alsa/scripts/alsa-info.sh should
> probably go into ALSA-Configuration.txt
> I also suggest to add a troubleshooting section into the navigation block
> of the entry page of alsa wiki (or move the existing one there -- I have
> not been able to easily find an existing one though) which mentions this
> link as well as all other stuff that a user should be aware of when
> reporting a problem.
> If it isn't easy to provide concise troubleshooting instructions it would
> at least be helpful to give an overview where and how to find the relevant
> info in the wiki.
> After all the user having a problem often is just starting learning alsa.
> Best,
> Michael
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Tobin Davis  

	"I thought you were trying to get into shape."
	"I am. The shape I've selected is a triangle."
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