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From: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
To: Mark Watts <m.watts@eris.qinetiq.com>
Subject: Re: HDIO_SET_DMA failed on a Dell Latitude C400 Laptop
Date: Mon, 12 Jul 2004 17:37:34 +0200
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Make sure that you have the driver for your IDE chipset compiled-in or
(if you are using IDE as module) that you load it and not ide-generic.

On Monday 12 of July 2004 15:22, Mark Watts wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> > I've just burnt a cd for the first time on a Dell Latitude C400 laptop
> > and I noticed that the system was quite sluggish while the burn was
> > happening. (mouse pointer erratic, window redraw slow etc).
> >
> > Remembering a similar issue with a desktop system, I did the following to
> > enable DMA on the hard drive (hdparm was giving ~3MB/sec read)
> >
> > # hdparm -c1 -d1 /dev/hda
> >
> > /dev/hda
> >  setting 32-bit IO_support flag to 1
> >  setting using_dma to 1 (on)
> >  HDIO_SET_DMA failed: Operation not permitted
> >  IO_support   =  1 (32-bit)
> >  using_dma   =  0 (off)
> >
> >
> > hdparm now reports ~7MB/sec which is better but still prety poor.
> >
> >
> > Any ideas why I couldn't set DMA on the drive?
> >
> >
> > CPU = Mobile Pentum 3 @1.2GHz (800MHz when booted with no power cord)
> > Ram = 256MB
> > HDD = IBM Travelstar (IC25N020ATDA04-0) 20GB
> > BIOS Rev = A12
>
> Kernel is a 2.6.7 kernel...