HDIO_SET_DMA failed: Operation not permitted

[John Summerfied]

François Patte wrote:
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> 
> Bonjour,
ullo ullo
> 
> 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?

Did you try searching with google, using text from the message, your 
drive's make/model and maybe with "linux?"

Try that; then offer more info to the list. It's likely to be something 
that occurs with your model and few others; earlier today I turned DMA 
on for one of my drives.

FWIW I never use -X34, partly because I don't see a use for it, partly 
because the one time I did I had to reboot immediately afterwards.



-- 

Cheers
John

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