Re: [xine-user] DMA and dvd playiing

[Rashkae <ra...@we...>]

Neither Xine nor Ogle turn off DMA.  This is being done by the kernel,
either because there were read errors trying to read the DVD or as a
workaround to buggy chipsets.  (Since you had this working before with a
different DVD drive, I will presume your chipset is fine for use with
Linux.)

Also, you can run into trouble trying to share IDE devices on a single bus
with devices of a different UDMA generation.  You may have to connect your
DVD drive on a cable of it's own, as opposed to the same cable as a HD.
Also, make sure that Master and Slave are all explicitely set on your IDE
devices (no Cable Selects).

Check dmesg after you've started playing any DVD's with dma on to find
kernel messages that might give a clue to what's happening.

On Mon, 19 Aug 2002, michael norman wrote:

This is a message I sent to the SuSE list

Anybody here help as well ?

DMA and Xine and ogle
From: michael norman <mic...@li...>
To: SuSE Linux-e <sus...@su...>

Hi all

For a long time I have been able to get dvd play in SuSE using xine.  Until
recently when my Relysis dvdrom drive died.  Fortunately I got a replacement
AOPEN drive as the old one was still within guarantee.  Unfortunately I can
only get choppy dvd replay using xine and the new drive.  The solution to
this in the past has been to set dma on the drive.  This I have done using
both yast2 and hdparm from the command line.  But I still get choppy dvd even
immediately after setting dma on the drive,  When I check whether dma is
still on immediately after playing a dvd it is off again.  My conclusion is
that xine (and I have just repeated this using Ogle is that invoking a dvd
playing programme is turning off dma before the dvd starts.  I have also
checked that if I set dma, don't use xine or ogle that it is still set on
reboot.  FWIW dvd replay with this drive with dma set is perfect in w98.  But
I want to watch dvds in linux.

Is it really possible that both these programmes are turning off dma as soon
as I use them ?.  Would putting the relevant command in a startup script help
?  If so which one.

I am somewhat baffled.

TIA

Mike


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