Difficulty playing DVDs under AHCI/CAM?

[Buganini]

BTW, it seems that DVD burning with ahci is broken,
burning a CD is okay, but I never burn a DVD sucessfully with ahci.
Always get somethings like "unable to write at 60H input/output error"
and many "(cd0:ahcich2:0:0:0): SCSI sense: ILLEGAL REQUEST
csi:43,0,0,c asc:24,0 (Invalid field in CDB): Command byte 6 is
invalid"
in dmesg,

With ahci unloaded, I see "(cd0:ata4:0:0:0): SCSI sense: ILLEGAL
REQUEST csi:43,0,0,c asc:24,0 (Invalid field in CDB): Command byte 6
is invalid" once, but it works.

But I can read data DVD with ahci and sucessfully verify data with diff.


--Buganini

On Sat, Aug 28, 2010 at 5:41 PM, Garrett Wollman <wollman at freebsd.org> wrote:
> In article <4C79499B.3050305 at icyb.net.ua> avg at icyb.net.ua writes:
>>> [I wrote:]
>>> ...say what?  Why is the cd driver suddenly returning ENXIO?
>>
>>Strange indeed.
>>Can you dtrace this read?  You can use combination of syscall and fbt providers
>>with execname predicate.
>
> You're going to have to be much much more specific than that.
>
> -GAWollman
>
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