RELENG_7 problem with playing DVDs

[[LoN]Kamikaze]

Olivier Brisson wrote:
>> Using mplayer to try play a DVD my errorconsole is spammed with:
>>
>> ata1: FAILURE - non aligned DMA transfer attempted
>> acd0: setting up DMA failed
>>
>> The mplayer just hangs around in physrd status and cannot be killed
>> (even by
>> kill -9). The error message gets posted until the system is shutdown.
>> The
>> mplayer process also stays alive for the whole time. The only way to
>> open the
>> DVD-drive after attempting to play the DVD is to reboot the system.
> 
> It seems that you have a hardware problem. Could you please try with an other drive?

I now find your suggestion more likely. I think it might be a cable problem
(both are on the same ata channel and thus use the same cable), fortunately I
have some spares, so I'll exchange the cable tonight and report weather that
was of any use.