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Date: Sat, 28 Aug 2010 20:38:35 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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To: Garrett Wollman <wollman@freebsd.org>
References: <19577.18337.120013.129482@hergotha.csail.mit.edu>
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Cc: current@freebsd.org
Subject: Re: Difficulty playing DVDs under AHCI/CAM?
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on 28/08/2010 20:30 Garrett Wollman said the following:
> After a recent upgrade, I switched to AHCI/CAM for my SATA devices,
> including a new DVD drive.  Now I find that nothing can play DVDs any
> more.  For example, here's what mplayer does:

[snip]

>   8469 initial thread CALL  close(0x4)
>   8469 initial thread RET   close 0
>   8469 initial thread CALL  read(0x3,0x7fffffffb4d0,0x800)
>   8469 initial thread RET   read -1 errno 6 Device not configured
> 
> ...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.

-- 
Andriy Gapon