Unable to enable DMA on my DVD drive

[Adam Membrey]

Bob Nielsen wrote:

>On Mon, Feb 21, 2005 at 03:54:14AM +1100, Adam Membrey wrote:
>  
>
>>Hi, I'm trying to enable DMA on my Pioneer Drive (DVD-RW DVR-108) as I'm 
>>experiencing gradual but huge losses between audio and video whilst 
>>watching DVDs using mplayer. I'm using sudo hdparm -d1 /dev/hda and I'm 
>>receiving the following error message:
>>
>>/dev/hda:
>>setting using_dma to 1 (on)
>>HDIO_SET_DMA failed: Operation not permitted
>>using_dma    =  0 (off)
>>    
>>
>
>Does 'hdparm -I /dev/hda' indicate any DMA capability?
>
>  
>
>>I do have throttling using powernowd but would that be affecting the 
>>loss I'm getting in any way?
>>
>>    
>>
>
>You could try killing powernowd and see if that makes any difference.
>
>Bob
> 
>
>  
>
Bob, thanks for replying.  hdparm on my DVD drive shows the following:

/dev/hda:
 using_dma    =  0 (off)

Oh and before people start questioning hda being my DVD drive, I use a 
SATA harddrive so the harddrive is /dev/sda :)

I might try using the emifreqd applet to ramp my cpu up to 2.2GHz and 
see if it makes a difference, but I would still like to enable DMA on my 
drive