Re: i810 sound broken...

From: Juergen Sawinski (
Date: Wed Aug 07 2002 - 13:49:08 EST

On Wed, 2002-08-07 at 17:05, Doug Ledford wrote:
> On Mon, Aug 05, 2002 at 08:38:52PM +0200, Thomas Munck Steenholdt wrote:
> > On Mon, 2002-08-05 at 17:28, Alan Cox wrote:
> > > On Mon, 2002-08-05 at 14:47, wrote:
> > > > Still OSS modules for i810 does not work with 2.5 kernels, actually 2.4
> > > > is fine. No time to switch to alsa (and not interested for now too).
> > >
> > > OSS for 2.5 is someone elses problem. I have no plan to do any work on
> > > the old OSS drivers for the 2.5 tree or even to submit 2.4 updates into
> > > 2.5 for it.
> > >
> >
> > So anyway - How should I go about determining the exact problem on my
> > box... I've had it all along, and I know for a fact that the hardware is
> > OK... Modules are loaded correctly, but it just does not work!
> I'll tell you what you can do. Grab some ICH docs so you have a list of
> the valid regs on the i810 sound chip. Then, go into i810_audio.c and
> write me up a little hack that, at the end of the chip init sequence,
> whill dump the state of all the regs on the chip. Make it smart enough to
> know about different regs on different chips (aka, Intel ICH0 and ICH1
> will probably have a slightly different reg setup than the ICH2 and
> later). Then, load that driver on your machine and get me that register
> dump. Then, I'll take the patch and apply it here on the i810 machines I
> have that do work and get their register dump. We'll see then where the
> differences are. On the i845 based machine I have at work, where the
> sound doesn't work just like you describe, I've isolated the problem down
> to the fact that when we start the DMA engine it *immediately* signals
> that it has already finished the DMA process and has already stopped again
> but it never actually does the DMA. So, I suspect there is some config
> bit somewhere set wrong and the DMA is not taking place as a result (hell,
> for all I know, the AC97 link for sound output may be off or something
> like that). Getting a register dump from several busted machines as well
> as from some working machines should enable me to solve the problem
> relatively easily. I just haven't had the time to write the patch myself
> and do any more work on the thing :-(

My i845 box seems to only have a tertiary codec (waiting for
verification from Intel) which is only accesible via DMA. I already
started to make this work... hope, I can show some code end of the week.

But there's sth. about i810_ac97_get. The ICH4 manual says, reads _must
not_ cross DWord boundaries. Could there be a problem?

> --
> Doug Ledford <> 919-754-3700 x44233
> Red Hat, Inc.
> 1801 Varsity Dr.
> Raleigh, NC 27606
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Juergen Sawinski
Max-Planck-Institute for Medical Research
Dept. of Biomedical Optics
Jahnstr. 29
D-69120 Heidelberg

Phone: +49-6221-486-309 Fax: +49-6221-486-325

priv. Phone: +49-6221-418 848 Mobile: +49-171-532 5302

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