HDIO_SET_DMA failed: Operation not permitted

[François Patte]

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Bonjour,

I have some problem to read dvd with xine under FC kernel 2.6.11-1.14_FC3.
According to xine-check, I have to try: hdparm -d1 -X34 /dev/hdc

But the answer is:

/dev/hdc:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 setting xfermode to 34 (multiword DMA mode2)
 using_dma    =  0 (off)

What is the reason? And what can I do to solve the problem?

Thank you for any help.
- --
François Patte
Ecole française d'Extrême-Orient
Université Paris 5
http://www.math-info.univ-paris5.fr/~patte

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