DVD playback issue: FAILURE - non aligned DMA transfer attempted

[Adam Vandemore]

Novembre wrote:
> I am trying to rip a part of a DVD to my hard drive on my RELENG_7 machine
> (as of February 19, 2009)
> using mencoder. I have '/dev/cd0    /home/mnt/cdrom    cd9660
> ro,noauto    0    0' in /etc/fstab and the
> following two lines in /etc/devfs.conf:
> own    /dev/cd0    root:operator
> perm    /dev/cd0    0660
>
> I mount the DVD to ~/mnt/cdrom and run gmplayer to see if it can play the
> DVD. Right-clicking on the
> MPlayer-Video window and selecting Preferences-->Misc, I have set "DVD
> device" and "CD-ROM device"
> (the last two lines) to /dev/cd0 (otherwise it won't even recognize the
> drive). Then, by right-clicking on
> MPlayer-Video, I select 'DVD-->Open disc...' and it shows some information
> about the DVD (like the number
> of chapters, audio streams, subtitles, etc.) in the terminal window from
> which gmplayer was run and then
> nothing happens except a non-stop hard drive activity. I suspected something
> and checked /var/log/messages.
> The following two lines are being constantly, non-stop added to
> /var/log/messages:
> Apr  1 17:04:30 rsx4 kernel: ata3: FAILURE - non aligned DMA transfer
> attempted
> Apr  1 17:04:30 rsx4 kernel: acd0: setting up DMA failed
> and I can't even close (or kill -9, for that matter) gmplayer. If I shut
> down X, then I see a constant stream
> of the previous two lines on the screen as the text-mode is coming up; there
> is no command prompt. If I let
> it continue, finally the /var partition will fill up. Also, even after
> logging out of X, the gmplayer process is
> still running and cannot be killed. Using Alt-F2 to switching to other
> terminals becomes painfully slow and
> at some point it stops responding. The only way is to reboot the system.
> Note that it doesn't crash or panic
> or anything. I just can't type anything after a while because of all these
> error messages...
>
> I have these two lines in /boot/loader.conf
> hw.ata.ata_dma="1"
> hw.ata.atapi_dma="1"
> in my first try. After the first failed attempt and reboot, googling around
> led me to change the last line to
> hw.ata.atapi_dma="0"
> to no avail.
>
> I would like to, at least, play this DVD, so I'd appreciate any
> help...thanks
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>   
Not 100% on this, but I think I solved this on my system awhile ago by 
setting dvd drive region code.

-- 
Adam Vandemore
Systems Administrator
IMED Mobility
(605) 498-1610