DVD DMA

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Hi, i am trying to enable dma in Redhat 8 on my dvd drive, so i can
watch dvds. mplayer plays them, except that they are jerky when the dvd
has to keep reading, then pauses between reads. I tried adjusting cache
options for mplayer with no luck, and tried adjusting the speed of the
drive.

does anyone know why 

|# hdparm -d1 /dev/cdrom
|
|/dev/cdrom:
| setting using_dma to 1 (on)
| HDIO_SET_DMA failed: Operation not permitted
| using_dma    =  0 (off)

fails. the dvd drive is a fairly nice (panasonic?) dvd drive, that plays
dvds admirably in windows (when media player will let it...)

thanks.

Anton
-- 
Anton Piatek		| map02@doc.ic.ac.uk 
			|
anton@piatek.co.uk	| Dept of Mathematics,
			| Imperial College,
07900-951-627		| London, UK
---
Wise men speak when they have something to say. 
Fools speak when they have to say something. - Plato



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