ATA_CAM for extradummies

Alexander Motin mav at
Thu Dec 24 07:45:13 UTC 2009

Diego Depaoli wrote:
> Trying to rip a DVD with ogmrip which uses libdvd[read | nav | css] my
> system becomes unusable.
> Syslog repeats many and many times:
> ahcich0: port is not ready (timeout 10000ms) tfd = 00000480
> ahcich0: device ready timeout
> ahci0: <ATI IXP700 AHCI SATA controller> port
> I can only poweroff the machine since reboot hangs syncing the buffers.
> After restart, verbose dmesg causes kernel panic.

As soon as your DVD drive is on PATA channel, errors are not directly
related to ripping. I think it is related to device scanning before it.
I think libdvd tries to send SCSI commands to SATA disks, which is not
handled properly by IXP700 AHCI controller.

Alexander Motin

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