[xine-user] Turning on DMA

[Cal M. <cmo...@ch...>]

I'm running Red Hat 8.0. I can play DVDs with xine, but they are 
choppy.  xine-check says DMA is disabled on my DVD drive (Sony 16X). The 
problem is when I try to turn on DMA using hdparm (hdparm -d1 /dev/hdc) 
I get the following error:

/dev/hdc:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)
[root@diablo root]#

Can anyone tell me why DMA isn't turning on? Or better yet, how to turn 
it on. Thanks!