DVD playback not working

[Michael Neumann]

Simon 'corecode' Schubert wrote:
Hey,

Yesterday night I tried to play a DVD.  No luck.  I tried with Ubuntu, 
no luck either until I installed libdvdcss.  So my drive works, but 
DragonFly has no means of playing a DVD.

That's pathetic.

A selection of error messages (all with libdvdcss installed):

ogle:
(from dmesg)
ata0: FAILURE - non aligned DMA transfer attempted
acd0: setting up DMA failed
Googling for "non aligned DMA transfer attempted" lead me to this page
(in German):
http://www.bsdforen.de/showthread.php?p=185404

So it seems FreeBSD (7.0) has the same problem. Someone suggests the
following:
  natacontrol mode acd0 pio4

Regards,

  Michael