Re: update: DVD play back on G3 iBook - improving

["Jon Cortelyou" <jcortelyou@pacbell.net>]

Hi Ben,

Thanks for the tips.  I'll see if I can figure out what is causing the DMA 
to be turned off.  I remember I had this same problem with YDL 3.0.1 on the 
same machine.

> Tried disabling DRC ?
DRC is Digital Room Correction?

Where would I disable that?

Regards,
Jon

----- Original Message ----- 
From: "Benjamin Herrenschmidt" <benh@kernel.crashing.org>
To: "Jon Cortelyou" <jcortelyou@pacbell.net>
Cc: <debian-powerpc@lists.debian.org>
Sent: Saturday, October 30, 2004 4:53 PM
Subject: Re: update: DVD play back on G3 iBook - improving


> On Sat, 2004-10-30 at 11:10 -0700, Jon Cortelyou wrote:
> > Good news on the DVD play back issues I was having with my iBook
> > running Ubuntu Linux v4.10.
> >
> > First I have to type:  hdparm -d1 /dev/hdb
> > this turns on UDMA2 for my DVD-ROM
> > Where would I put this command so it is done automatically at boot up?
>
> It should be done automatically at boot, I suspect something is
> switching DMA off, that happens with some errors, which is imho a bug in
> the ide-cd layer of the kernel. If you can identify what command exactly
> is causing it to be turned off, let me know.
> > I'm getting a 'popping/clicking' sound when the DVD plays loud sounds.
> > The popping occurs over the iBook's speakers and via headphones.  I
> > tried adjusting the volume but even at low volume I hear
> > audible popping.  It seems like the audio is clipping.  It happens at
> > all volume levels.  gxine and xine-ui both have this problem.  I'm
> > using the ALSA sound modules that (I think) emulates OSS?
>
> Tried disabling DRC ?