Re: [xine-user] DMA and hdparm

[Andrew Longland-M. <an...@lo...>]

Hi again everyone!

On Sat, 2005-03-12 at 18:53, Darren Salt wrote:
> I demand that Michael Roitzsch may or may not have written...
> 
> > Hi Andrew,
> >> When playing DVDs I was getting jumpy video, so following advice on the
> >> website I used hdparm to discover that DMA was switched off. So I switched
> >> it on.
> 
> >> However, when I open up xine and play a DVD, the DMA setting gets switched
> >> off again so I still get the jumpy video!!
> 
> > The kernel sometimes does this when DMA goes wrong or read errors occur.
> > Could you check the syslog for any related messages?
> 
> Another thing to check is the IDE cable. It may be that DMA is disabled
> because the cable is marginal or damaged or, perhaps, the wrong cable type is
> in use. Do you have a spare cable which you can swap in?
> 
> BTW, when you switched DMA on, did you also ensure that an appropriate mode
> was selected?

Thanks to everyone who replied.

Yes the BIOS is setting up DMA correctly, using udma2 mode; yes the
kernel is disabling DMA according to dmesg; and no, I haven't tried
changing the cable yet - I will when I get chance.

In the meantime, if changing the cable makes no difference, is there any
way of preventing the kernel disabling DMA?

TIA

Andrew
-- 
Andrew Longland-Meech <an...@lo...>