DVD playback not working

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

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

mplayer:
(from dmesg):
ata0: FAILURE - non aligned DMA transfer attempted
acd0: setting up DMA failed

now hangs in wchan "ATA re"

pathetic.