How do I turn on DMA for ide-scsi DVD drives

spmirowski spmirowski at
Tue Feb 5 05:43:27 UTC 2008

Message: 1
> Date: Mon, 04 Feb 2008 21:03:07 -0500
> From: Ric Moore <wayward4now at>
> Subject: Re: How do I turn on DMA for ide-scsi DVD drives
> To: For users of Fedora <fedora-list at>
> Message-ID: <1202176987.1182.80.camel at>
> Content-Type: text/plain
> On Mon, 2008-02-04 at 08:04 -0800, spmirowski wrote:
>> Alan Cox wrote:
>>> On Wed, 30 Jan 2008 19:37:36 -0800
>>> spmirowski <spmirowski at> wrote:
>>>> Hello,
>>>> Back when Fedora handled disc drives as ide, I would use hdparm to turn 
>>>> on DMA.  Now that Fedora 8 seems to run them as SCSI devices, hdparm 
>>>> can't tell them to turn on DMA.  Any ideas how to get them blazing fast 
>>>> again?
>>> Its always done automatically by libata.
>>> Alan
>> Thanks,
>> It would appear the issue wasn't DMA, but nvidia-config omitted 
>> something from my xorg.conf that allows hardware acceleration for XVideo.
> ... and that was? Inquiring minds would like to know! :) Ric
The appropriate method would have been to make one change at a time in 
the conf and test, but
I didn't want to spend that amount of time on it =P My guess is the fix 
was in Section "Module".

Here nvidia-config only puts "Load "glx"". In a prior working xorg.conf 
I had

Section "Module"
Load "dbe"
Load "extmod"
Load "type1"
Load "freetype"
Load "glx"

At least one of those Loads is for the composite graphics, but I can't 
remember which one.

The following was mainly for composite and extra features, thus I 
wouldn't expect these to
be part of the fix:

Section "ServerFlags"
Option "AIGLX" "on"


Section "Extensions"
Option "Composite" "Enable"

 From Section "Screen" to Section "Device" I moved:

Option "RandRRotation" "True"
Option "RenderAccel" "True"

and added to Section "Device":

Option "AddARGBGLXVisuals" "True"
Option "DisableGLXRootClipping" "True"

for composite.


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