Ok, I think I have the fix for this.

from the release notes:

DMA is disabled on CD-ROM drives in this release in a different but more 
reliable way than
previously. If you are sure that your CD-ROM drive is capable of IDE 
DMA, place the following
line in the /etc/modules.conf

options ide-cd dma=1

you will then be able to turn DMA on for your cd


Keith Winston wrote:

>I have an IDE DVD drive (/dev/hdc) and I would like to turn on DMA to
>speed up playback of movies in ogle.
>
>In SuSE 8.0, I am able to use:
>hdparm -d1 -X34 /dev/hdc
>to turn on DMA and it makes a huge difference in playback frame rates.
>
>When I use this command (as root) in Red Hat 8.0, I get an error...
>/dev/hdc:
>    Setting using_dma to 1 (on)
>    HDIO_SET_DMA failed: Operation not permitted
>    using_dma = 0 (off)
>
>I verified that the device was owned by root and rw for root.  Does
>anyone know why this doesn't work?
>
>Best Regards,
>Keith
>  
>



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