Thanks for the suggestions.
I went ahead and updated the /boot/grub/menu.lst file to add the ide=nodma. Here's the area of that file that I modified.
title Ubuntu 7.10, kernel 2.6.22-14-generic
kernel /boot/vmlinuz-2.6.22-14-generic root=/dev/sda1 ro quiet splash ide=nodma
I rebooted after making the change and it seemed to make no difference. Video playback is still very choppy.
I decided that maybe it was the DVD drive so I swapped it out for another one. (Lite-On SHW-1635S) and I'm having the same issues.
On bootup, the hdparm /dev/hdc still shows;
using_dma = 0 (on)
However, after putting a DVD in the drive, it switches the output of the hdparm /dev/hdc command to:
using_dma = 0 (off)
It's still showing the same messages in the /var/log/messages file about disabling DMA. (see OP)
What's odd is that this is the same mobo used in the video if I'm not mistaken, I've had issues playing DVD's on both 0704 and 0710 now. Am I the only one experiencing this issue?
On 0704 I had the same issue as posted here http://forum.linuxmce.org/index.php?topic=2577.0
With 0710 things are choppy. I'm just wondering what I'm doing wrong....
I'm not even sure if DMA is the issue. Are there any other avenues that I might want to look into to improve the DVD playback experience?
Thanks again everyone!